[chore] security CI/CD workflows sha-pin actions #87
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In lights of https://skroutz.slack.com/archives/CP43TUJDU/p1742189867715899
We need to SHA PIN all github actions, as a measure for Supply Chain attacks Example: https://github.com/skroutz-internal/yogurt/blob/master/.github/workflows/prod-deploy.yaml#L78
Rationale: https://docs.github.com/en/actions/security-for-github-actions/security-guides/security-hardening-for-github-actions?learn=getting_started#using-third-party-actions