Add GitHub Actions workflow for Docker demo publishing

Introduced a new GitHub Actions workflow to automate the publishing of demo Docker containers to ghcr.io. Updated docker-compose demo configuration to use pre-built Docker images instead of building them locally.

.github/workflows/docker-publish-demo.yml

@@ -0,0 +1,101 @@
+name: Publish Demo Containers to Ghcr.io
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+on:
+  push:
+    # Publish semver tags as releases.
+    tags: [ 'v*.*.*', 'demo' ]
+
+env:
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  DEMO-SERVER_IMAGE_NAME: ${{ github.repository }}-demo-server
+
+jobs:
+  build-and-publish-server-demo:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@v3.5.0
+        with:
+          cosign-release: 'v2.2.4'
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.SERVER_IMAGE_NAME }}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v6
+        with:
+          context: ./server-demo
+          build-contexts: |
+            shared-lib=./shared-lib
+          build-args: |
+            NODE_ENV: production
+          target: production
+          provenance: false
+          cache-from: type=gha,scope=buildkit
+          cache-to: type=gha,mode=max,scope=buildkit
+          platforms: linux/amd64,linux/arm64,linux/arm64/v8
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=target,annotation-index.org.opencontainers.image.description=Squirrel Servers Manager (SSM) Server
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+

docker-compose.demo.prod.yml

@@ -2,8 +2,7 @@ version: '3.8'
 services:
   proxy-demo:
     restart: unless-stopped
-    build:
-      context: ./proxy
+    image: "ghcr.io/squirrelcorporation/squirrelserversmanager-proxy:latest"
     ports:
       - "8000:8000"
     depends_on:
@@ -21,8 +20,5 @@ services:
     restart: unless-stopped
     depends_on:
       - server
-    build:
-      context: ./client
-      additional_contexts:
-        - shared-lib=./shared-lib
-      target: production
+    image: "ghcr.io/squirrelcorporation/squirrelserversmanager-client:latest"
+