feat: Add GH action to automatically update Transition Monitor Docker Build Status portion of README.md

[jdhoffa]

The Transition Monitor Docker Build Status is currently just a static placeholder for info that should be automatically updated.

I would like to have a GitHub action that:

• Takes the latest nightly build of workflow.transition.monitor: https://github.com/RMI-PACTA/workflow.transition.monitor/pkgs/container/workflow.transition.monitor/194298613?tag=nightly
• Builds private images with the appropriate PACTA data
• Updates the Build Status table in the README.md of this repo with appropriate build info and links to the dev reports

To be based heavily on https://github.com/RMI-PACTA/workflow.transition.monitor/blob/main/.github/workflows/build-and-push-Docker-image.yml

cc @AlexAxthelm

AB#10661

[AlexAxthelm]

@jdhoffa Not self contained, but you may want to look at the invocation of the add-comment action in workflow.transtion.monitor. Right now, it's set to only run if it's on a PR event, but it wouldn't be difficult to have it trigger a push here on scheduled events (which are the ones that are building nightly).

https://github.com/RMI-PACTA/workflow.transition.monitor/actions/runs/8383423748

[jdhoffa]

Strategy 1

• In workflow.transition.monitor: duplicate the add-comment action (but maybe name it something like update-sit-rep) to run nightly (using all the latest on main packages)
• Give that new action write access to this repo (pacta.sit.rep), and have it push a PR that updates the README directly?

Strategy 2

• Add a workflow to pacta.sit.rep that attempts to run the whole build process again and update the README there

@AlexAxthelm just to understand, you would prefer Strategy 1?
I think I agree, but I've never tried to set an action up to open PRs in a totally separate repo, so will have to explore how to do that!

[jdhoffa]

Superseded by #27