workaround for trivy scanner rate limiting

.github/workflows/trivy.yml

@@ -22,13 +22,25 @@ jobs:
             github.com:443
             pkg-containers.githubusercontent.com:443
       - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+      - name: Trivy Cache
+        uses: yogeshlonkar/trivy-cache-action@v0
+        with:
+          gh-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Run Trivy vulnerability scanner
         uses: aquasecurity/trivy-action@6e7b7d1fd3e4fef0c5fa8cce1229c54b2c9bd0d8 # v0.24.0
+        continue-on-error: true
         with:
           scan-type: fs
           format: sarif
-          output: trivy-results.sarif
+          cache-dir: .trivy
+          output: results.sarif
+      - name: Check file existence
+        id: check_files
+        uses: andstor/file-existence-action@076e0072799f4942c8bc574a82233e1e4d13e9d6 # v3.0.0
+        with:
+          files: results.sarif
       - name: Upload Trivy scan results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@461ef6c76dfe95d5c364de2f431ddbd31a417628 # v3.26.9
+        if: steps.check_files.outputs.files_exists == 'true'
         with:
-            sarif_file: trivy-results.sarif
+            sarif_file: results.sarif