Dockerimage based env also now for test

[LeaSeep]

addresses #571

The app's R environment is shipped now as a Docker image (pauljonasjost/comicsart) built from renv.lock
— no local renv restore needed.

For the github actions now 2 workflows:

• build-image.yml — rebuilds the image only when the environment changes (renv.lock, Dockerfile, or start.sh), on any branch. It pushes a lock- tag (matched to the lockfile) and a tag on every branch; :latest Docker tag is updated only from main/develop.
• start_check.yaml — runs on every push. It pulls the image whose lock- matches the current renv.lock (waiting for build-image.yml to finish if the lock just changed), mounts the checked-out app code into it, and smoke-tests that the app starts. - Fast image pull take ~1 minute, then test duration (at the moment just start of the app)

Net effect: change a package → push → the matching image builds and the smoke test runs against it; merging to main/develop publishes that environment as :latest

For Local use and development (to also use the docker-based env) - same image, two modes via MODE:

App mode (default):
docker run --rm -p 3838:3838 pauljonasjost/comicsart:latest
http://localhost:3838/
Development / RStudio mode:
docker run --rm -p 8787:8787 -e MODE=rstudio -e PASSWORD=… -v "$PWD/program":/home/rstudio/project pauljonasjost/comicsart:latest
http://localhost:8787/ (user rstudio)

The latest tag should be inline with what is on develop

[LeaSeep]

note that e1071 was is now installed. In the docs you finde how to add packages. Let me know if it works for you!