remove github action format check
remove github action format check

Even though Actions aren't supported on the main repo, they can still be
supported on personal repos, and people might proactively fix their
Windows bustage if GitHub sends them emails about it.  So let's keep
Actions, but turn off things we haven't enabled on Travis yet.

mozilla/sccache,mozilla/sccache,luser/sccache2,luser/sccache2,glandium/sccache,glandium/sccache,mozilla/sccache,glandium/sccache,luser/sccache2,glandium/sccache,luser/sccache2