chore: build docker test image

.github/workflows/ui-test.yml

@@ -0,0 +1,37 @@
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: A job to say hello
+    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:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: thomasnordquist/mqtt-explorer-ui-tests:latest
+  test:
+    runs-on: ubuntu-latest
+    container:
+      image: thomasnordquist/mqtt-explorer-ui-tests:latest
+      volumes:
+        - ./:/app
+    steps:
+      - name: Install Packages
+        run: yarn install --frozen-lockfile
+      - name: Build
+        run: yarn build
+      - name: Install Packages
+        run: yarn ui-test