Play with docker build

.github/workflows/docker.yml

@@ -0,0 +1,19 @@
+name: Docker
+
+on:
+  - push
+
+jobs:
+  docker:
+    name: 'Docker: Build'
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          push: false
+          context: .
+          target: test