github: Add Trivy snap scanning

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

.github/workflows/security.yml

@@ -46,3 +46,44 @@ jobs:
           sarif_file: "trivy-lxd-repo-scan-results.sarif"
           sha: ${{ env.GITHUB_SHA }}
           ref: refs/heads/main
+
+  trivy-snap:
+    name: Trivy vulnerability scanner - Snap
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        version:
+          - latest
+          - "5.21"
+          - "5.0"
+          - "4.0"
+        risk:
+          - stable
+    permissions:
+      security-events: write # for uploading SARIF results to the security tab
+    if: ${{ ( github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' ) }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: main # All snap scanner results are placed on the main branch
+
+      - name: Setup Trivy vulnerability scanner
+        run: |
+          mkdir -p sarifs
+          VER=$(curl --silent -qI https://github.com/aquasecurity/trivy/releases/latest | awk -F '/' '/^location/ {print  substr($NF, 1, length($NF)-1)}');
+          wget https://github.com/aquasecurity/trivy/releases/download/${VER}/trivy_${VER#v}_Linux-64bit.tar.gz
+          tar -zxvf ./trivy_${VER#v}_Linux-64bit.tar.gz
+
+      - name: Run Trivy vulnerability scanner on the snap
+        run: |
+          snap download lxd --channel=${{ matrix.version }}/${{ matrix.risk }}
+          unsquashfs ./lxd*.snap
+          ./trivy rootfs ./squashfs-root/ --format sarif > ${{ matrix.version }}-${{ matrix.risk }}.sarif
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: "${{ matrix.version }}-${{ matrix.risk }}.sarif"
+          sha: ${{ env.GITHUB_SHA }}
+          ref: refs/heads/main