Create docker-image.yml

Signed-off-by: Felix Wong <felix@waf.hk>

.github/workflows/docker-image.yml

@@ -0,0 +1,17 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Build the Docker image
+      run: |
+        cd docker
+        make