Build man page as part of workflows

[blairconrad]

Fixes #74.
Closes #149. (Which it includes.)

[blairconrad]

Happy to change anything (especially dedup once you're otherwise happy, if the repetition offends).

You can see recent workflows:

• build
• release

Note: there are a fair number of warnings, but I don't think my changes made them qualitatively worse. Probably an extra "The set-output command is deprecated...", but this appears to be coming in from actions that are already being used. Likely upload-artifact, but it's just a guess.

Also, release 2.0.5 was created from those builds.

Oh, one quite disappointing thing (for me) is that the man page generation is VERY slow. Mostly in staging the environment. An asciidoctor docker image exists that on my local machine gave much faster results (once I pulled the imager the first time; don't know if that'd be an issue for the GitHub Actions runner), if the (lack of) speed is a concern. The output was nearly the same as that for the existing build process, and could probably be closer with minor massaging of the git-absorb.txt input.

[blairconrad]

couldn't figure out how to supply a value directly from the command line, so aliased the attribute

[blairconrad]

Okay, that's all I have. If the changes can better fit your vision, do let me know.

[tummychow]

works for me. the flag should be an easy speedup, but otherwise i don't care too much about how long it takes to run in ci

[tummychow]

could you add --no-install-recommends? probably part of the reason it's slow is it's installing texlive, which has tons of heavy binary assets in it (eg fonts)

[blairconrad]

Rebasing to resolve conflicts (and make viewing subsequent diffs easier).

[blairconrad]

I opted to incorporate the change instead of

** OMG that was fast! build-man-page beat any of the test runs! I didn't even have time to finish taht comment about the fixups I was making and will continue now! **

pushing the fixup and squashing later, since it's so simple and you can see it in the Compare link anyhow.

[blairconrad]

Whoops. Forgot release.yml. Fixed.