OIDC customization settings not persistent

[mononym]

Hello,
I want to comment out the following entries in homeserver.yaml so that users can define their matrix usernames.

user_mapping_provider:
      config:
        #localpart_template: '{{ user.sub }}'
        #display_name_template: '{{ user.name }}'
        email_template: '{{ user.email }}'

But when restarting the app, the two lines are added again, uncommented, overwriting my changes.

[mononym]

Guess it has something to do with app/pkg/start.sh

# oidc
if [[ -n "${CLOUDRON_OIDC_ISSUER:-}" ]]; then
    echo " ==> Configuring OIDC auth"
    yq eval -i ".oidc_providers[0].idp_id=\"cloudron\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].idp_name=\"${CLOUDRON_OIDC_PROVIDER_NAME:-Cloudron}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].issuer=\"${CLOUDRON_OIDC_ISSUER}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].client_id=\"${CLOUDRON_OIDC_CLIENT_ID}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].client_secret=\"${CLOUDRON_OIDC_CLIENT_SECRET}\"" /app/data/configs/homeserver.yaml

    yq eval -i ".oidc_providers[0].scopes=[\"openid\", \"email\", \"profile\"]" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].authorization_endpoint=\"${CLOUDRON_OIDC_AUTH_ENDPOINT}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].token_endpoint=\"${CLOUDRON_OIDC_TOKEN_ENDPOINT}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].userinfo_endpoint=\"${CLOUDRON_OIDC_PROFILE_ENDPOINT}\"" /app/data/configs/homeserver.yaml
    # https://s3lph.me/ldap-to-oidc-migration-3-matrix.html
    yq eval -i ".oidc_providers[0].allow_existing_users=true" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].skip_verification=true" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].user_mapping_provider.config.localpart_template=\"{{ user.sub }}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].user_mapping_provider.config.display_name_template=\"{{ user.name }}\"" /app/data/configs/homeserver.yaml
    yq eval -i ".oidc_providers[0].user_mapping_provider.config.email_template=\"{{ user.email }}\"" /app/data/configs/homeserver.yaml
else

Basically, the script should not update the homeserver.yaml localpart_template key, if its value was set (manually) to null (changing it to null is maybe easier to detect than just commenting it out).