ci: pin github actions by hash and update via dependabot #3067
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Description
Pinning 3rd-party GitHub Actions by commit SHA makes them less vulnerable to compromise of the 3rd party. To avoid outdating and non-verbosity, versions are commented after the SHA and updating via dependabot is introduced that will automatically update the commented version tag as well.
In case of a false commit SHA, this change could break the corresponding workflow. Typically, this does not cause major interruptions, but it can for example affect a release pipeline and require restart causing delays.
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