Switch to GitLab CI for automated building

This adds building and uploading checks for the develop and master branch. It also adds a simple build check for all merge requests to the develop or master branch. Right now the destination directories for uploads only point to a temporary directory and only my laptop is configured as a GitLab runner.

added Enhancement label

added 1 commit

• bb3fd1cc - Define CI stages

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merged

mentioned in commit d7588d0a