feat(ci): add trivy workflow

Author: jsjoeio

.github/workflows/trivy.yml

@@ -43,8 +43,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Build an image from Dockerfile
-        run: |
-          docker build -t codercom/code-server:${{ github.sha }} --file ./ci/release-image/Dockerfile .
+        run: ./ci/steps/build-docker-image.sh
 
       - name: Run Trivy vulnerability scanner in image mode
         uses: aquasecurity/trivy-action@master