Feat: Add image scan for vela core (#3210)

Signed-off-by: Jianbo Sun <jianbo.sjb@alibaba-inc.com>

.github/workflows/codeql-analysis.yml

@@ -5,6 +5,30 @@ on:
     branches: [ master, release-* ]
 
 jobs:
+  images:
+    name: Image Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Build Vela Core image from Dockerfile
+        run: |
+          docker build --build-arg GOPROXY=https://proxy.golang.org -t docker.io/oamdev/vela-core:${{ github.sha }} .
+
+      - name: Run Trivy vulnerability scanner for vela core
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'docker.io/oamdev/vela-core:${{ github.sha }}'
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v1
+        if: always()
+        with:
+          sarif_file: 'trivy-results.sarif'
+
   analyze:
     name: Analyze
     runs-on: ubuntu-latest