add CI to compose supergraph schema and publish to OCI

.github/workflows/schema-compose.yaml

@@ -0,0 +1,117 @@
+name: Schema
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  generate:
+    # Deduplicate jobs from pull requests and branch pushes within the same repo.
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Rover CLI
+        run: |
+          curl -sSL https://rover.apollo.dev/nix/latest | sh
+          echo "$HOME/.rover/bin" >> $GITHUB_PATH
+
+      - name: Checkout Source
+        uses: actions/checkout@v4.1.4
+
+      - name: Compose Supergraph Schema
+        run: >
+          rover supergraph compose
+          --config supergraph-config.yaml
+          --elv2-license=accept
+          > supergraph.graphql
+
+      - name: Upload New Schema Artifact
+        uses: actions/upload-artifact@v4.3.3
+        with:
+          name: supergraph.graphql
+          path: supergraph.graphql
+
+  publish:
+    # Deduplicate jobs from pull requests and branch pushes within the same repo.
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
+    needs:
+      - generate
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4.1.4
+
+      - name: Setup Helm
+        uses: azure/setup-helm@v4.0.0
+
+      - name: Download Schema Artifact
+        uses: actions/download-artifact@v4.1.7
+        with:
+          name: supergraph.graphql     
+          path: charts/supergraph
+
+      - name: Package Chart
+        run: helm package charts/supergraph
+
+      - name: Generate Image Name
+        run: echo IMAGE_REPOSITORY=oci://ghcr.io/$(echo "${{ github.repository }}-supergraph" | tr '[:upper:]' '[:lower:]' | tr '[_]' '[\-]') >> $GITHUB_ENV
+
+      - name: Log in to GitHub Docker Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3.0.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish Chart
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: helm push $(ls supergraph-*.tgz) ${{ env.IMAGE_REPOSITORY }}
+
+  compare_schema:
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'pull_request' }}
+    steps:
+      - name: Install Rover CLI
+        run: |
+          curl -sSL https://rover.apollo.dev/nix/latest | sh
+          echo "$HOME/.rover/bin" >> $GITHUB_PATH
+
+      - name: Checkout main branch
+        uses: actions/checkout@v4.1.4
+        with:
+          ref: main
+
+      - name: Compose old Supergraph Schema
+        run: >
+          rover supergraph compose
+          --config supergraph-config.yaml
+          --elv2-license=accept
+          > /tmp/old_supergraph.graphql
+
+      - name: Checkout Source
+        uses: actions/checkout@v4.1.4
+
+      - name: Compose New Supergraph Schema
+        run: >
+          rover supergraph compose
+          --config supergraph-config.yaml
+          --elv2-license=accept
+          > supergraph.graphql
+
+      - name: Generate Schema Diff
+        run: |
+          git --no-pager diff --no-index --no-exit-code --minimal /tmp/old_supergraph.graphql supergraph.graphql > diff.md
+          if [ -s diff.md ]; then echo "has_diff=true" >> $GITHUB_ENV; fi
+          sed -i 1,4d diff.md
+          sed -i '1s/^/```diff\n/; $a```' diff.md
+
+      - name: Comment PR with artefact comparison report
+        if: env.has_diff == 'true'
+        uses: JoseThen/comment-pr@v1.2.0
+        with:
+          file_path: diff.md
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

charts/supergraph/Chart.yaml

@@ -1,3 +1,3 @@
 apiVersion: v2
 name: supergraph
-version: 0.1.0
+version: 0.1.1

charts/supergraph/template/schema-configmap.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: supergraph-schema
+  name: {{ .Release.Name }}-supergraph-schema
 data:
   supergraph.graphql: |-
     {{ (.Files.Get .Values.supergraphPath) | nindent 4 }}