.github: Attempt to un-break Clang 9 action

GitHub removed Clang 9 from the 20.04 image[1], breaking this build.
Thus, manually add the specific versioned packages we need for the
Ubuntu jobs to ens

.github: Attempt to un-break Clang 9 action

GitHub removed Clang 9 from the 20.04 image[1], breaking this build.
Thus, manually add the specific versioned packages we need for the
Ubuntu jobs to ensure they're installed. Note that we don't do the same
for macOS, as Homebrew does not allow multiple llvm@N to co-exist,
giving an error if you attempt to install a second one. In practice we
don't actually use the compiler field here for anything other than the
build name, it's only the cross-bindir that matters, so when it
eventually moves to 12 the name will get confusing but the job will
still work.

MFC after: immediately

[1] https://github.com/actions/virtual-environments/commit/15a610677be406d250c1f6732b03c8b87e693a0a

(cherry picked from commit e5f5b6a75c0aa0f51a399e2002d15b51211630b5)

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Enable GitHub actions CI for stable/13 as well

All cross-building patches have been merged to stable/13 so it should
also build fine on macOS+Linux.

Reviewed By: uqs
MFC after: immediately
Differen

Enable GitHub actions CI for stable/13 as well

All cross-building patches have been merged to stable/13 so it should
also build fine on macOS+Linux.

Reviewed By: uqs
MFC after: immediately
Differential Revision: https://reviews.freebsd.org/D29831

(cherry picked from commit 6bc0bb2936a41674bc992887ba17fddfa928ac90)

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