add docker build to ci.yml

.github/workflows/ci.yml

@@ -34,3 +34,14 @@ jobs:
     - name: Build
       run: |
         yarn build
+
+  docker-build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: docker build
+      run: |
+        docker build .
+