v2 improvements and fixes

[the-horo]

Addresses:

• https://github.com/dlang-community/setup-dlang/issues/78
• https://github.com/dlang-community/setup-dlang/pull/77#discussion_r1623223650

As a summary of changes:

• additionally to DC to action will set DMD to point to the dmd wrapper of the compiler
• the compiler: gdmd input has been removed, gdmd is now always installed alongside gdc
• dmd is now usable on arm64 macos
• all the dependencies has been updated.
• the target output has become es2022 from es2017
• recent releases of dub will now use arm64 binaries on arm64 macos
• added unittests written in typescript that can be run with npm test (on any platform). The current workflow when contributing can be:

  # make changes
  npm test
  npm run build
  git commit && git push # and wait for CI

• fix the verify-d-compiler action which incorrectly tried to run a shared library

[the-horo]

This is fantastic work, thank you! Main concern is gdmd_sha should have an option for latest. Haven't fully reviewed the tests as it's pretty massive, but overall looks very good, thanks!

One note, README says:

Changes from v2

Should it be Changes from v1 or are we going for v3 so soon?

Depends on how we want to perceive the v2 branch. If we consider it as being a normal release then yes, the action should be bumped to v3 as there has been one breaking change:

• using compiler: gdmd is no longer supported

This could be fixed by reallowing that input and making DC point to DMD to preserve the generated environment. Now that I consider, setting DMD on top of DC does sound like a breaking change since users may have been using that variable.

Keep in mind that I say this with the previous PR which I've made in mind that ended up breaking other projects' CI because of the changes.

If the v2 branch is perceived as v2-alpha, so a prerelease, then yeah, it's fine to keep it at v2. Or at least that how I think semver is supposed to work for actions

[Geod24]

Regarding v2, it's not an -alpha one unfortunately (https://github.com/dlang-community/setup-dlang/releases/tag/v2.0.0) but I don't think it would add much value to the users to bump to v3 so early.

[the-horo]

I've tried to address your issues (except for the indentation style) let me know if you're fine with the solutions.

I spotted that I accidentally removed the gdc CI tests when introducing $DMD but now their back

[the-horo]

Resetting the GITHUB_ENV and GITHUB_PATH environment variables is a cleaner way to run the unittests during CI compared to importing internal functions.

[Geod24]

@the-horo : Will try to review again tonight / tomorrow but I expect this can go in soon. Also invited you to the project.

[the-horo]

Thanks. Feel free to work on your pace as I'll have the time to fix stuff if you find anything broken.

[Geod24]

Thanks a lot @the-horo ! The nice commit history and the amount of testing is greatly appreciated.