Hi team,

We're trying to create our custom Docker image for OpenProject to get our own plugin up and running. We've been following these instructions: https://www.openproject.org/docs/installation-and-operations/installation/docker/#openproject-plugins

This is our Dockerfile:

FROM openproject/openproject:16 AS plugin

# If installing a local plugin (using `path:` in the `Gemfile.plugins` above),
# you will have to copy the plugin code into the container here and use the
# path inside of the container. Say for `/app/vendor/plugins/openproject-slack`:
# COPY /path/to/my/local/openproject-slack /app/vendor/plugins/openproject-slack

COPY Gemfile.plugins /app/
COPY plugins/openproject-pathways /app/plugins/openproject-pathways

# If the plugin uses any external NPM dependencies you have to install them here.
# RUN npm add npm <package-name>*

RUN bundle config unset deployment && bundle install && bundle config set deployment 'true'
RUN rm -f config/frontend_assets.manifest.json
RUN ./docker/prod/setup/precompile-assets.sh

FROM openproject/openproject:16-slim

COPY --from=plugin /usr/bin/git /usr/bin/git
COPY --chown=$APP_USER:$APP_USER --from=plugin /app/vendor/bundle /app/vendor/bundle
COPY --chown=$APP_USER:$APP_USER --from=plugin /app/plugins /app/plugins
COPY --chown=$APP_USER:$APP_USER --from=plugin /usr/local/bundle /usr/local/bundle
COPY --chown=$APP_USER:$APP_USER --from=plugin /app/public/assets /app/public/assets
COPY --chown=$APP_USER:$APP_USER --from=plugin /app/config/frontend_assets.manifest.json /app/config/frontend_assets.manifest.json
COPY --chown=$APP_USER:$APP_USER --from=plugin /app/Gemfile.* /app/

Initially this looks like it's working - however it doesn't actually build our plugin in correctly. We have a frontend component that needs to be linked into the core frontend, and looking at ./docker/prod/setup/precompile-assets.sh it is skipping the linking because the frontend assets (of the core) already exists. That's why we added  RUN rm -f config/frontend_assets.manifest.json above to force the linking. And then the Docker build fails, seemingly because there is no valid database connection (which is reasonable at build time).

43.14 + SECRET_KEY_BASE=1
43.14 + RAILS_ENV=production
43.14 + DATABASE_URL=nulldb://db
43.14 + bin/rails openproject:plugins:register_frontend assets:precompile
48.49 bin/rails aborted!
48.50 ArgumentError: undefined class/module ActiveRecord::ConnectionAdapters::PostgreSQL:: (ArgumentError)

Any ideas how we get around that without a database connection (this Docker build usually runs in our Github workflows)?