Use the hash of the spack.yaml as part of the Github Action cache key

[kgerheiser]

Pull Request Summary

Now, whenver the spack.yaml changes the CI will rebuild the dependencies.

Currently they can go stale unless the cache key is manually changed.

Also, cancel in-progress workflows when pushing to a branch to avoid duplicate workflow runs.

Issue(s) addressed

Fix #751

Commit Message

Use the hash of the spack.yaml as part of the Github Action cache key
Cancel in-progress workflows when pushing to a branch to avoid duplicate workflow runs.

Check list

• Branch is up to date with the authoritative repository (NOAA-EMC) develop branch.
• Checked the checklist for a developer submitting to develop.
• If a version number update is required, checked the updating version number checklist.
• If a new feature was added, a regression test for testing the new feature is added.

Testing

• Only changes the CI build. The checks should pass when the builds complete.

[JessicaMeixner-NOAA]

Thank you @kgerheiser !!!!

@aliabdolali should we add on the wiki page somewhere about "changing a library" so we can write this down there since we don't do this type of change often and might forget?

[aliabdolali]

The resgtests passed successfully on Hera and guideline is added to the the wiki/code management page.
pre-known non-identical cases:

**********************************************************************
********************* non-identical cases ****************************
**********************************************************************
mww3_test_03/./work_PR2_UQ_MPI_d2                     (15 files differ)
mww3_test_03/./work_PR2_UNO_MPI_d2                     (9 files differ)
mww3_test_03/./work_PR3_UQ_MPI_d2_c                     (15 files differ)
mww3_test_03/./work_PR1_MPI_d2                     (17 files differ)
mww3_test_03/./work_PR3_UNO_MPI_d2_c                     (15 files differ)
mww3_test_03/./work_PR3_UNO_MPI_d2                     (17 files differ)
mww3_test_03/./work_PR3_UQ_MPI_d2                     (16 files differ)
ww3_tp2.10/./work_MPI_OMPH                     (7 files differ)
ww3_tp2.16/./work_MPI_OMPH                     (4 files differ)
ww3_tp2.6/./work_ST4                     (1 files differ)
ww3_tp2.6/./work_ST0                     (1 files differ)
ww3_ufs1.3/./work_a                     (1 files differ)

matrixCompFull.txt
matrixCompSummary.txt
matrixDiff.txt