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Referencing actions by commit SHA in GitHub workflows guarantees you are using an immutable version. Actions referenced by tags and branches are more vulnerable to attacks, such as the tag being moved to a malicious commit or a malicious commit being pushed to the branch. It's important to make sure the SHA's are from the original repositories and not forks. For reference: https://github.com/actions/checkout/releases/tag/v4.1.08ade135a41
https://github.com/actions/upload-artifact/releases/tag/v3.1.3a8a3f3ad30
Signed-off-by: Gabriela Gutierrez <gabigutierrez@google.com>