Add Workbench session init container image

[skyeturriff]

Part of https://github.com/rstudio/rstudio-pro/issues/6920

Hoping to get some early(ish) feedback on adding a new image. I know this might be a bit awkward given this repo is in a bit of transition, so want to help mitigate any headaches/future pains where I can and make sure I'm doing things properly!

This image will be the new init container as part of Workbench's efforts to improve session components. I used connect-content-init as my example for how to set this up.

So far I've only added a new bake target for a daily build. I added this to the build-manual and build-bake-preview github workflows.

NOTE This also updates the rstudio_workbench_daily branch to kousa dogwood in get-version.py

I've tested this locally via

just preview-bake workbench-session-init-daily
mkdir init
docker run --rm -v $(pwd)/init:/mnt/init rstudio/workbench-session-init-preview:workbench-session-init-jammy-2024.11.0-daily-328.pro3

I also included a basic goss test.

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[bschwedler]

Will this also help us reduce what is included in the session image?

• https://github.com/rstudio/rstudio-docker-products/pull/624

[skyeturriff]

Will this also help us reduce what is included in the session image?

@bschwedler That's the goal, yes! We'll use the init container to load all the session-specific components( vscode, rsession, rserver-launcher, etc.) into the session image, so the session image itself only needs to include the basics (system dependencies, R, python, etc.). Zach's prototype includes an example "base" session image here

[skyeturriff]

I'm going to merge this in as-is so we can start to get dailies for testing, and address what's remaining (adding the release build, swapping out the run script, a more robust goss test) in follow-up PR(s)

[zachhannum]

@ianpittwood @bschwedler does the repo need to be created manually on the dockerhub side of things? https://github.com/rstudio/rstudio-docker-products/actions/runs/11611641762/job/32333438273#step:4:1398

[ianpittwood]

@ianpittwood @bschwedler does the repo need to be created manually on the dockerhub side of things? https://github.com/rstudio/rstudio-docker-products/actions/runs/11611641762/job/32333438273#step:4:1398

Oh yes, let me go do that for you guys.

[ianpittwood]

@zachhannum @skyeturriff it had a successful build now to Dockerhub.