add test workflow for docker

Author: michield

.github/workflows/docker-test.yml

@@ -0,0 +1,31 @@
+
+
+name: Upload to S3
+
+on:
+  push:
+    tags: testing-[1-9]+.[0-9]+.[0-9]+
+
+jobs:
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/phplist-dev:latest