Add dockerhub push action

.github/workflows/build-and-push.yml

@@ -0,0 +1,44 @@
+name: CI Workflow
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Login to DockerHub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+    - name: Lint the code
+      id: lint
+      run: |
+        docker build --build-arg APP_ENV=test -t lint-test-image .
+        docker run --rm --entrypoint pre-commit lint-test-image run --all-files
+
+    - name: Build and push Docker image
+      if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+      uses: docker/build-push-action@v6
+      with:
+        context: .
+        file: ./Dockerfile
+        # No need to build for anything other than arm64 currently
+        # platforms: linux/amd64,linux/arm64
+        platforms: linux/arm64
+        push: true
+        tags: ${{ secrets.DOCKERHUB_USERNAME }}/rpi5-k8s-node-bootstrapper:latest,${{ secrets.DOCKERHUB_USERNAME }}/rpi5-k8s-node-bootstrapper:${{ github.sha }}