MIT might be the best choice, still, including other projects requires a legal advice.

The script in use triggers when a push is accompanied by a tag at the moment. It has to be changed so that it starts when there is a change to the repo files only.

• draft document - every repo change
• release build - when there is a new tag only

This saves a lot of resources and time. It would be also great to have separate filenames for drafts/releases as well as commits/tags in the aforementioned names.

Currently, it takes about 2 minutes to build the document which is unacceptable.
The reason for this is that GitHub doesn't offer a default solution for LaTeX-based actions.

Replacing the custom LaTeX action with the default ubuntu-latest might improve the results, but it has to be tested first.

The act package is a nice tool for local tests, however, it is based on docker which is infamous for its issues with root permissions.
Some of the actions used here prevent act from being used meaning every change in the code has to be pushed to see if it works.
This seriously increases the overall time of development.

Again, this issue requires some investigation first.

Apparently, there are other projects of this kind: here and here. The former is based on Travis CI and is of no relevance (and seems to be no longer maintained), the latter is: a fork of the first one, too massive, and doesn't seem to have all the required features.

Either way, they both have to be checked for nice ideas if any.