Build libDifferent CI

[Stefterv]

Closes #913

This GitHub Action will:

• Trigger when changes are pushed to either core/different/different.m or core/different/Makefile
• Create a pull request with the new binaries
  • An example of this can be found here: Update generated files from make Stefterv/processing4#4

[hx2A]

I'm not the best person to review github actions, but from what I know about them, this looks good to me.

One more change I'd suggest is that we add the compiled library file to .gitignore to discourage anyone from including them in a commit or future PR. I realize this github action would overwrite library files created by PR submitters and adding it to .gitignore doesn't prevent anyone from overriding the ignore directive. I still think it would be a good idea to include it there though.

[Stefterv]

Yeah I thought about that but then the ci for the pull request previews wouldn't work.

As example, you submitted a change and I would like to test that change, then I would need a build with the new binary in Processing to make sure it works. I think the only way would be to allow the binary to be part of the PR

[hx2A]

Yeah I thought about that but then the ci for the pull request previews wouldn't work.

As example, you submitted a change and I would like to test that change, then I would need a build with the new binary in Processing to make sure it works. I think the only way would be to allow the binary to be part of the PR

Oh, I see. You need the compiled binary to be in the PR so the CI testing will work. There's no way for the CI stuff to compile it itself, before running tests?

[Stefterv]

Good you ask, I just realized only macOS can export for macOS so maybe it can just be part of the build chain.

I was under the impression that libDifferent needed to be included on other platforms too

In any case core is compiled and posted on Linux and I'd prefer not to change that.

[hx2A]

OK, good we talked this through and understand how everything will work moving forward.

[hx2A]

Looks good! This will compile the native thinkdifferent library, needed for macOS computers