Implement Github workflows for C# PHPand JS

[dbaileychess]

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I removed some commented out workflows for C#, PHP, and JS in https://github.com/google/flatbuffers/pull/6948, they should be implemented at some point. This is to track that work and point to the code that was removed.

[dbaileychess]

C# is done.

[dbaileychess]

JS should be covered: https://github.com/google/flatbuffers/blob/master/.github/workflows/build.yml#L449-L463

@bjornharrtell do we need explicit JS testing?

[bjornharrtell]

@dbaileychess not at this time. The current tests does test JavaScript in the "modern way" i.e via individual ES modules (transpiled from TS).

However, if/when we can get https://github.com/google/flatbuffers/issues/7426 and https://github.com/google/flatbuffers/issues/7448 resolved that could warrant a second test run on those artifacts which would be the same tests but against "old school non modular single file built JavaScript".

[github-actions[bot]]

This issue is stale because it has been open 6 months with no activity. Please comment or label not-stale, or this will be closed in 14 days.

[github-actions[bot]]

This issue was automatically closed due to no activity for 6 months plus the 14 day notice period.