Fix and improve caching in GitLab CI

added 3 commits

• 09e2f369...1e701f50 - 2 commits from branch master
• 37bc5379 - Fix and improve caching in GitLab CI

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added 4 commits

• 37bc5379...f1b133aa - 3 commits from branch master
• e5380cdc - Fix and improve caching in GitLab CI

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assigned to @frust45

added Enhancement::CI/CD Progress::3_Doing labels

@jandt-desy This should fix the caching bug that we hit from time to time. Could you please check?

added Bug Progress::4_Can review labels and removed Progress::3_Doing label

requested review from @jandt-desy

added Progress::5_Under review label and removed Progress::4_Can review label

requested review from @hueser93 and removed review request for @jandt-desy

approved this merge request

resolved all threads

removed Progress::5_Under review label

added Progress::6_Can merge label

mentioned in commit 65867984

merged

mentioned in issue #370 (closed)