Set up Siteforge container deployment and registry publishing

.github/copilot-instructions.md

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+- [x] Verify that the copilot-instructions.md file in the .github directory is created.
+- [x] Clarify Project Requirements.
+- [x] Scaffold the Project.
+- [x] Customize the Project.
+- [x] Install Required Extensions. No extensions were required by project setup info.
+- [x] Compile the Project.
+- [x] Create and Run Task.
+- [x] Launch the Project. User chose not to launch debug mode now.
+- [x] Ensure Documentation is Complete.
+
+- Work through each checklist item systematically.
+- Keep communication concise and focused.
+- Follow development best practices.

.github/workflows/docker-publish.yml

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+name: Publish Container
+
+on:
+  push:
+    branches: ["main"]
+    tags: ["v*"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    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: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/nmemmert/siteforge
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha
+            type=ref,event=tag
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}