Add test github action.

Author: gizmoguy

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: Test workflow
+
+on: [push, pull_request]
+
+jobs:
+  docker-image:
+    name: "Build docker image"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up qemu
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+      - name: Set up docker buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+      - name: Run buildx
+        run: |
+          docker buildx build \
+            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x \
+            --file Dockerfile \
+            .