fix: use base64 output file for provenance for large assets #7496
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Summary
GH jobs redacts base64 encoded string of large assets and might contain secrets. There is no way to pass the encoded digest as job outputs for provenance.
Failed workflow: https://github.com/Kong/insomnia/actions/runs/9383289942/job/25836570705#step:8:49 with digest redacted leading to send failed job output considered sensitive
Issue: https://github.com/orgs/community/discussions/37942
Solution:
Refer https://github.com/slsa-framework/slsa-github-generator/blob/main/internal/builders/generic/README.md#getting-started