github/zizmor: add action that checks actions security #206
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This should give us some "Code scanning" alerts when GitHub workflows are implemented poorly.
Note that the backport action will trigger an alert, due to the fact that we have to use
pull_request_target
, which is inherently hard to use securely.Inspired by:
https://woodruffw.github.io/zizmor/usage/#use-in-github-actions