fix trivy scan and enable caching of vulnerability DB

.github/workflows/trivy-security-scan.yml

@@ -1,15 +1,40 @@
 ##
-# This action runs trivy container and repository vulnerability
-# scanner for docker images and cargo packages.
+# This action runs Trivy container and repository vulnerability
+# scanner for Docker images and filesystem.
 ##
 
 name: trivy-security-scan
 
 on:
   repository_dispatch:
-    types: [ trivy-scan-dispatch ]
+    types: [trivy-scan-dispatch]
+  schedule:
+    - cron: '0 0 * * *'  # Runs daily at midnight UTC
 
 jobs:
+  update-trivy-db:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup oras
+        uses: oras-project/setup-oras@9c92598691bfef1424de2f8fae81941568f5889c # v1.21
+
+      - name: Get current date
+        id: date
+        run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
+
+      - name: Download and extract the vulnerability DB
+        run: |
+          mkdir -p $GITHUB_WORKSPACE/.cache/trivy/db
+          oras pull ghcr.io/aquasecurity/trivy-db:2
+          tar -xzf db.tar.gz -C $GITHUB_WORKSPACE/.cache/trivy/db
+          rm db.tar.gz
+
+      - name: Cache DBs
+        uses: actions/cache@v4
+        with:
+          path: ${{ github.workspace }}/.cache/trivy
+          key: cache-trivy-${{ steps.date.outputs.date }}
+
   wait-for-image:
     runs-on: ubuntu-latest
     outputs:
@@ -48,38 +73,60 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
+      - name: Restore Trivy DB cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ github.workspace }}/.cache/trivy
+          key: cache-trivy-${{ steps.date.outputs.date }}
+
       - name: Run Trivy vulnerability scanner on image
-        uses: aquasecurity/trivy-action@d710430a6722f083d3b36b8339ff66b32f22ee55 # @v0.19.0
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2 # v0.28.0
         with:
           image-ref: ${{ github.event.client_payload.image }}
+          cache: 'true'
           format: "sarif"
           output: "trivy-results.sarif"
           exit-code: "1"
           ignore-unfixed: true
           vuln-type: "os,library"
           severity: "CRITICAL,HIGH"
+        env:
+          TRIVY_SKIP_DB_UPDATE: true
+          TRIVY_SKIP_JAVA_DB_UPDATE: true
 
       - name: Upload Trivy scan results to GitHub Security tab
-        uses: github/codeql-action/upload-sarif@4759df8df70c5ebe7042c3029bbace20eee13edd # @v2.23.1
+        uses: github/codeql-action/upload-sarif@4759df8df70c5ebe7042c3029bbace20eee13edd # v2.23.1
         with:
           sarif_file: "trivy-results.sarif"
 
   trivy_scan_repo:
+    needs: update-trivy-db
     runs-on: ubuntu-latest
+
     steps:
       - name: Checkout code
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
+      - name: Restore Trivy DB cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ github.workspace }}/.cache/trivy
+          key: cache-trivy-${{ steps.date.outputs.date }}
+
       - name: Run Trivy vulnerability scanner in repo mode
-        uses: aquasecurity/trivy-action@d710430a6722f083d3b36b8339ff66b32f22ee55 # @v0.19.0
+        uses: aquasecurity/trivy-action@915b19bbe73b92a6cf82a1bc12b087c9a19a5fe2 # v0.28.0
         with:
           scan-type: fs
+          cache: 'true'
           ignore-unfixed: true
           format: sarif
           output: trivy-results.sarif
           severity: CRITICAL
+        env:
+          TRIVY_SKIP_DB_UPDATE: true
+          TRIVY_SKIP_JAVA_DB_UPDATE: true
 
       - name: Upload Trivy scan results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@1b1aada464948af03b950897e5eb522f92603cc2 # v3.24.9
         with:
-          sarif_file: trivy-results.sarif
+          sarif_file: "trivy-results.sarif"