fix: allow for alpha and beta releases in addition to stable

This adds alpha and beta releases, which are already supported for syncing to cvmfs.

requested review from @veprbl

assigned to @wdconinc

enabled an automatic merge when the pipeline for 7ffca9aa succeeds

aborted the automatic merge because target branch was updated

added 1 commit

• a5c2a124 - fix: allow for alpine /bin/sh grouping syntax

Compare with previous version

added 1 commit

• 4795c6be - fix: allow for alpine /bin/sh regex grouping syntax

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added 4 commits

• ce371b41 - 1 commit from branch master
• 2ac3ce68 - fix: allow for alpha and beta releases in addition to stable
• 550ea596 - fix: allow for alpine /bin/sh grouping syntax
• 67b80205 - fix: allow for alpine /bin/sh regex grouping syntax

Compare with previous version

added 5 commits

• 67b80205...89a9cb1f - 2 commits from branch master
• 9d696ef7 - fix: allow for alpha and beta releases in addition to stable
• 1abcb860 - fix: allow for alpine /bin/sh grouping syntax
• e58d903d - fix: allow for alpine /bin/sh regex grouping syntax

Compare with previous version

enabled an automatic merge when the pipeline for e58d903d succeeds

merged