Add GitHub Actions workflow for Docker publishing

.github/workflows/docker-publish.yml

@@ -0,0 +1,60 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ "main" ]
+    # Optional: Trigger on tag creation (e.g., v1.0, v2.0)
+    tags: [ 'v*.*.*' ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  # Use your Docker Hub username and repo name here
+  # Format: username/repository-name
+  IMAGE_NAME: ${{ secrets.DOCKERHUB_USERNAME }}/netsecgame
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # Set up QEMU (Optional: only needed if you want to build for multiple architectures like ARM64)
+      # - name: Set up QEMU
+      #   uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      # This step extracts metadata (tags, labels) for Docker
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }} # Don't push on PRs, just build
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max