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feat: use GitHub Actions cache to persist the CernVM-FS cache #37

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wdconinc
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- uses: actions/cache@v4
if: ${{ inputs.actions_cache == 'true' }}
with:
key: cvmfs-cache-${{ steps.lsb-release.outputs.id-release }}-${{ steps.lsb-release.outputs.arch }}-${{ hashFiles('action.yml') }}
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Suggested change
key: cvmfs-cache-${{ steps.lsb-release.outputs.id-release }}-${{ steps.lsb-release.outputs.arch }}-${{ hashFiles('action.yml') }}
key: cvmfs-cache-${{ steps.lsb-release.outputs.id-release }}-${{ steps.lsb-release.outputs.arch }}

as seen in #40, using ${{ hashFiles('action.yml') }} as part of the key is not reliable as the file being hashed as very unlikely to appear in other repositories and causes caches to always miss.

with:
key: cvmfs-cache-${{ steps.lsb-release.outputs.id-release }}-${{ steps.lsb-release.outputs.arch }}-${{ hashFiles('action.yml') }}
path: |
${{ inputs.cvmfs_cache_base }}
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Suggested change
${{ inputs.cvmfs_cache_base }}
${{ inputs.cvmfs_cache_base }}

One further issue may be that the cache directory is used for a number of locks and marker files that we may not want to cache. I think in the end you only want to keep the actual data files in the hash directories ./00/ ... ./ff and maybe the ./cachedb file.

I'll test a few configurations to see what works best.

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