Add docker scan

.github/workflows/docker-scan.yml

@@ -0,0 +1,29 @@
+name: Docker security scan
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-20.04
+    if: ${{ !contains(github.event.head_commit.message, 'docs:') }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Build an image from Dockerfile
+        run: |
+          docker buildx install
+          docker buildx build --load --platform linux/amd64 -t docker.io/sitespeedio/node:${{ github.sha }} .
+      
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'docker.io/sitespeedio/node:${{ github.sha }}'
+          format: 'table'
+          exit-code: '1'
+          ignore-unfixed: true
+          vuln-type: 'os,library'
+          severity: 'CRITICAL'