Merge pull request #756 from DFE-Digital/workflow-build-docker

Test the docker build if the Dockerfile changes

.github/workflows/docker-build.yml

@@ -0,0 +1,23 @@
+name: Docker build
+
+on:
+  pull_request:
+    paths:
+      - Dockerfile
+    types: [opened, synchronize]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build docker image
+        uses: docker/build-push-action@v5
+        with:
+          secrets: github_token=${{ secrets.GITHUB_TOKEN }}
+          push: false