Ok so I realized the app is listening on 8080, so I changed the EXPOSE in my docker file 8080 and updated that in my CloudronManifest.json as well.
Here are some of the logs from docs:
Jul 21 21:05:29 box:shell reload spawn: /usr/bin/sudo -S /home/yellowtent/box/src/scripts/reloadnginx.sh
Jul 21 21:05:29 box:shell reload (stdout): nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/applications/1ad8de27-5af8-4a6b-8009-894d67480ca6.conf:32
Jul 21 21:05:29 box:shell reload (stdout): nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/applications/6c952513-f9e1-4518-b775-ed6e27828aee.conf:32
Jul 21 21:05:29 box:shell reload (stdout): nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/applications/a5bd18fe-5f58-4933-bb02-fa81b16c2403.conf:32
Jul 21 21:05:29 box:shell reload (stdout): nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/applications/c55a8d0e-bad9-4a9b-bdde-2c516260b4cb.conf:32
Jul 21 21:05:29 box:tasks 1024: {"percent":100,"message":"Done"}
Jul 21 21:05:29 box:apptask docs.rileyscloud.net updating app with values: {"installationState":"installed","error":null,"health":null}
Jul 21 21:05:29 box:tasks setCompleted - 1024: {"result":null,"error":null}
Jul 21 21:05:29 box:tasks 1024: {"percent":100,"result":null,"error":null}
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:579)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:240)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
Jul 21 21:05:33 at org.eclipse.jetty.server.Server.start(Server.java:416)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
Jul 21 21:05:33 at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
Jul 21 21:05:33 at org.eclipse.jetty.server.Server.doStart(Server.java:383)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1572)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1512)
Jul 21 21:05:33 at java.base/java.security.AccessController.doPrivileged(Native Method)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1511)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Jul 21 21:05:33 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.invokeMain(Main.java:220)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.start(Main.java:486)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.main(Main.java:77)
Jul 21 21:05:33 Caused by:
Jul 21 21:05:33 java.nio.file.FileSystemException: /data: Read-only file system
Jul 21 21:05:33 at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100)
Jul 21 21:05:33 at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
Jul 21 21:05:33 at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
Jul 21 21:05:33 at java.base/sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:385)
Jul 21 21:05:33 at java.base/java.nio.file.Files.createDirectory(Files.java:689)
Jul 21 21:05:33 at java.base/java.nio.file.Files.createAndCheckIsDirectory(Files.java:796)
Jul 21 21:05:33 at java.base/java.nio.file.Files.createDirectories(Files.java:782)
Jul 21 21:05:33 at com.sismics.docs.core.util.DirectoryUtil.getBaseDataDirectory(DirectoryUtil.java:44)
Jul 21 21:05:33 at com.sismics.docs.core.util.DirectoryUtil.getDataSubDirectory(DirectoryUtil.java:104)
Jul 21 21:05:33 at com.sismics.docs.core.util.DirectoryUtil.getLogDirectory(DirectoryUtil.java:86)
Jul 21 21:05:33 at com.sismics.util.filter.RequestContextFilter.init(RequestContextFilter.java:53)
Jul 21 21:05:33 at org.eclipse.jetty.servlet.FilterHolder.initialize(FilterHolder.java:139)
Jul 21 21:05:33 at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:741)
Jul 21 21:05:33 at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:374)
Jul 21 21:05:33 at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
Jul 21 21:05:33 at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
Jul 21 21:05:33 at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:847)
Jul 21 21:05:33 at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
Jul 21 21:05:33 at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:46)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:192)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:505)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:151)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:180)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.providers.WebAppProvider.fileAdded(WebAppProvider.java:453)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:64)
Jul 21 21:05:33 at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:610)
Jul 21 21:05:33 at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:529)
Jul 21 21:05:33 at org.eclipse.jetty.util.Scanner.scan(Scanner.java:392)
Jul 21 21:05:33 at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:313)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:150)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:579)
Jul 21 21:05:33 at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:240)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
Jul 21 21:05:33 at org.eclipse.jetty.server.Server.start(Server.java:416)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
Jul 21 21:05:33 at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
Jul 21 21:05:33 at org.eclipse.jetty.server.Server.doStart(Server.java:383)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1572)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1512)
Jul 21 21:05:33 at java.base/java.security.AccessController.doPrivileged(Native Method)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1511)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Jul 21 21:05:33 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.invokeMain(Main.java:220)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.start(Main.java:486)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.main(Main.java:77)
Jul 21 21:05:33 2020-07-22 03:05:33.976:INFO:oejs.AbstractConnector:main: Started ServerConnector@55259aa7{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
Jul 21 21:05:33 2020-07-22 03:05:33.977:INFO:oejs.Server:main: Started @5275ms
Jul 21 21:05:33 2020-07-22 03:05:33.977:WARN:oejuc.FileNoticeLifeCycleListener:main:
Jul 21 21:05:33 java.io.FileNotFoundException: /opt/jetty/jetty.state (Read-only file system)
Jul 21 21:05:33 at java.base/java.io.FileOutputStream.open0(Native Method)
Jul 21 21:05:33 at java.base/java.io.FileOutputStream.open(FileOutputStream.java:298)
Jul 21 21:05:33 at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:237)
Jul 21 21:05:33 at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:158)
Jul 21 21:05:33 at java.base/java.io.FileWriter.<init>(FileWriter.java:82)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.FileNoticeLifeCycleListener.writeState(FileNoticeLifeCycleListener.java:45)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.FileNoticeLifeCycleListener.lifeCycleStarted(FileNoticeLifeCycleListener.java:64)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.setStarted(AbstractLifeCycle.java:179)
Jul 21 21:05:33 at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:69)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1572)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1512)
Jul 21 21:05:33 at java.base/java.security.AccessController.doPrivileged(Native Method)
Jul 21 21:05:33 at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1511)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Jul 21 21:05:33 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Jul 21 21:05:33 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.invokeMain(Main.java:220)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.start(Main.java:486)
Jul 21 21:05:33 at org.eclipse.jetty.start.Main.main(Main.java:77)
Let me know if you see something I'm missing.