Run deploy checks also on forks
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This merge request is automatically copied from !1486 (merged) from branch https://source.coderefinery.org/nordugrid/arc/-/tree/gitlabrunnerdeploy orginally made by @maikenp
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Previously, to avoid too heavy strain on the gitlab runners, the deploy part of the gitlab CI has only run on the main repo (nordugrid/arc), i.e. only the build part was run on the forks.
It is useful to also run deploy CI on forks, to not only build, but check that jobs can run. If more runners are needed we will eventually create more to sustain the CI.