github: Add Trivy snap scanning

Signed-off-by: hamistao <[email protected]>

.github/workflows/security.yml

@@ -26,12 +26,16 @@ jobs:
         with:
           ref: main
 
+      - name: Create Trivy cache directory
+        run: mkdir -p /home/runner/vuln-cache
+
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@master
         with:
           scan-type: "fs"
           format: "sarif"
           output: "trivy-lxd-repo-scan-results.sarif"
+          cache-dir: "/home/runner/vuln-cache"
           severity: "LOW,MEDIUM,HIGH,CRITICAL"
 
       - name: Cache trivy and vulnerability database
@@ -46,3 +50,55 @@ jobs:
           sarif_file: "trivy-lxd-repo-scan-results.sarif"
           sha: ${{ github.sha }}
           ref: refs/heads/main
+
+  trivy-snap:
+    name: Trivy vulnerability scanner - Snap
+    runs-on: ubuntu-22.04
+    needs: trivy-repo
+    strategy:
+      matrix:
+        version:
+          - "latest"
+          - "5.21"
+          - "5.0"
+          - "4.0"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Snap scanner results are placed on the the branch related to the scanned channel.
+          ref: ${{ (matrix.version == 'latest' && 'main') || format('stable-{0}', matrix.version) }}
+
+      - name: Restore cached Trivy and vulnerability database
+        uses: actions/cache/restore@v4
+        with:
+          path: /home/runner/vuln-cache
+          key: trivy-cache
+
+      - name: Download snap for scan
+        run: |
+          ls /home/runner/vuln-cache
+          snap download lxd --channel=${{ matrix.version }}/stable
+          unsquashfs ./lxd*.snap
+
+      - name: Run Trivy vulnerability scanner on the snap
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: "rootfs"
+          format: "sarif"
+          scan-ref: squashfs-root
+          output: "${{ matrix.version }}-stable.sarif"
+          cache-dir: "/home/runner/vuln-cache"
+          severity: "LOW,MEDIUM,HIGH,CRITICAL"
+
+      - name: Prepend channel to alert name
+        run: |
+          jq '.runs[].tool.driver.rules[] |= (.shortDescription.text |= "Snap scan - " + .)' ${{ matrix.version }}-stable.sarif > tmp.json
+          mv tmp.json ${{ matrix.version }}-stable.sarif
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: "${{ matrix.version }}-stable.sarif"
+          sha: ${{ github.sha }}
+          ref: refs/heads/${{ (matrix.version == 'latest' && 'main') || format('stable-{0}', matrix.version) }}