Publish min build with GitHub action in orphan branch min

[WolfgangDrescher]

Based on my ideas in #117 here is a draft PR for how I would create the GitHub Action to automatically build the min files for the current master branch.

Some thoughts to consider:

• What git config user.name and git config user.email would you like to use?
• We should update min/README.txt to a Markdown file.
• Has support for midifile.h/midifile.cpp been dropped at some point? If so, we should remove it from min/README.txt.
• We need to stop automatically creating the min/humlib.* files when running the various make * commands. Could you help me identify which make commands should be updated, as I am not fully familiar with all the available make commands?

Feel free to close this PR if it does not align with your vision for the future direction of humlib.

[craigsapp]

That sound great!

What git config user.name and git config user.email would you like to use?

Probably:

git config --global user.name "Craig Stuart Sapp"
git config --global user.email "craigsapp@gmail.com"

Has support for midifile.h/midifile.cpp been dropped at some point? If so, we should remove it from min/README.txt.

I will need it in the future (if not already). I need to update hum2mid to use the midifile library. Probably copy it into humlib, but do not include in min/humlib.* (since it is already included in verovio). Also I need to update pugixml files (to match update from verovio as well)...