Create test-docker.yml

Testing out a file to have Github Actions test a Docker file when code changes.

.github/workflows/test-docker.yml

@@ -0,0 +1,41 @@
+name: ci
+
+on:
+  push:
+
+env:
+  TEST_TAG: user/app:test
+  LATEST_TAG: user/app:latest
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and export to Docker
+        uses: docker/build-push-action@v6
+        with:
+          load: true
+          tags: ${{ env.TEST_TAG }}
+
+      - name: Test
+        run: |
+          docker run --rm ${{ env.TEST_TAG }}
+      
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ env.LATEST_TAG }}