🐳 Add workflow to build & push docker image

.github/workflows/docker.yml

@@ -0,0 +1,42 @@
+name: Build and push Docker images to Docker Hub
+
+on:
+    workflow_dispatch:
+    push:
+        branches:
+        - main
+
+jobs:
+    build_docker_image:
+        # This workflow is only of value to Owner and would always be skipped in forks
+        if: github.repository_owner == 'agriyakhetarpal'
+        name: Build image
+        runs-on: buildjet-2vcpu-ubuntu-2204-arm
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - 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:
+                  username: ${{ secrets.DOCKERHUB_USERNAME }}
+                  password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+            - name: Build and push Docker image to Docker Hub
+              uses: docker/build-push-action@v5
+              with:
+                context: .
+                file: Dockerfile
+                tags: agriyakhetarpal/hugo:latest # To be updated with exact Docker Hub username and image name
+                push: true
+                platforms: linux/amd64, linux/arm64
+
+            - name: List built image(s)
+              run: docker images