Add GitHub action

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+on: [push, pull_request]
+
+name: Build
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    env:
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Build Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          push: false
+          tags: dev