action: post-run-job: try clean daemon container, warn on failure

[colemickens]

Description

This:

• carries a tiny commit to add a typescript LSP to our flake, which was useful even for this small change
• attempts to make cleaning up the docker daemon container aspiration
• attempts to make any failures to clean such container, non-fatal to the workflow

I say attempts because I haven't managed to hit this soft-failure path at all with GHA. I've done maybe a dozen runs, each of which containing 2 NS runs, and I've only seen happy path so far.

However, given a careful review, I think this change is still an improvement and safe to merge and iterate on whenever we see this actually repro in the wild.

Checklist

• Tested changes against a test repository (sort of, against this repo with dispathed workflows)
• Added or updated relevant documentation (leave unchecked if not applicable)
• (If this PR is for a release) Updated README to point to the new tag (leave unchecked if not applicable)

[colemickens]

Added another commit to use -f with pkill which is necessary for pkill to look at the arguments for kill consideration.

[grahamc]

This lgtm but I can't give it a actual code review right now, just an idea review.

[colemickens]

🎊