Scans the full git history on push, pull request and weekly, so a credential
that was committed and later removed is still detected. The scanner archive is
pinned by version and verified by SHA-256 before it runs, and matched values
are redacted so they never reach the CI log.
The accompanying allowlist covers two redaction test fixtures that assert
secret-shaped input is masked. Each entry is pinned to an exact commit, file,
rule and line, so a real secret added to those files later is still reported.