Add GitHub Actions workflow to push to Docker Hub

.github/workflows/docker-publish.yaml

@@ -0,0 +1,44 @@
+name: Publish Docker Image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81
+        with:
+          images: cloudflare/hello-world
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}