Only fail builds for high+ vulns

Since the vulnerability scan doesn't distinguish between
vulnerabilities added by the PR and those coming from vulnerability
updates, PRs are regularly blocked because of unrelated
vulnerabilities. Arguably this is desirable for important
vulnerabilities since it forces them to be handled; but other
vulnerabilities shouldn't block PRs.

This changes the fail threshold to high, so that only vulnerabilities
with severity high or critical will block the build.

Signed-off-by: Stephen Kitt <[email protected]>

.github/workflows/linting.yml

@@ -107,7 +107,7 @@ jobs:
         with:
           path: "."
           fail-build: true
-          severity-cutoff: negligible
+          severity-cutoff: high
       - name: Show Anchore scan SARIF report
         if: always()
         run: cat ${{ steps.scan.outputs.sarif }}