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Fixes a wrong description and a malfunctioning import of an action relative to the current path: GitHub Actions tries to load the file from the repository it was called from, not relative to the actions repository. To avoid hardcoding branch names or the repository name, I decided to inline the two setup steps into each action.
The gpg-sign action was also broken due to #1: the arguments weren't properly passed in when the loop was added. In addition, I moved the loop inside the container so that it doesn't have to be started for each file to be signed, but only once.