Create docker-publish.yml

Author: danielckv

.github/workflows/docker-publish.yml

@@ -0,0 +1,63 @@
+name: Build and Publish to GHCR
+
+# 1. Trigger the workflow on push to main branch
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch: # Allows you to run this manually from the Actions tab
+
+env:
+  REGISTRY: ghcr.io
+  # github.repository returns "owner/repo" (e.g., "yourname/sam3-project")
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    
+    # 2. Permissions required to write to GHCR
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # 3. Set up Docker Buildx (Critical for caching and platform support)
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # 4. Log in to the Container registry
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # 5. Extract metadata (tags, labels) for Docker
+      # This automatically tags the image as 'latest' on main branch push
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha,prefix=sha-
+
+      # 6. Build and push Docker image
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          # FORCE linux/amd64 to ensure NVIDIA compatibility
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # 7. Enable caching to speed up future builds
+          cache-from: type=gha
+          cache-to: type=gha,mode=max