Cleanup of generic-ci.sh variables

Closed Sven-Hendrik Haase requested to merge github/fork/juadde/github-actions-cleanup into master

Created by: juadde

As packer templates uses variables, variables overriding is not useful, and checks can be perfomed on those variables. (Would have prevented me to make a typo error last time) sha1sums.txt needs to be accessible however, in order to extract the sha1sum. I rely on pkgbuild.com for sha1sums.

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