Add support for publishing manifests

Author: Matt Pryor

.github/workflows/publish-release.yaml

@@ -9,6 +9,7 @@ on:
 env:
   REGISTRY: ghcr.io/stackhpc
   TAG: ${{ github.ref_name }}
+  RELEASE_ALIAS_TAG: ${{ github.ref_name }}
 
 jobs:
   build_push_images:
@@ -30,3 +31,19 @@ jobs:
 
       - name: Push images
         run: make docker-push-all
+
+  build_push_manifests:
+    name: Build and public manifests
+    runs-on: ubuntu-latest
+    # Only build and push the chart if the images built successfully
+    needs: [build_push_images]
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v2
+
+      - name: Generate manifest
+        run: make staging-manifests
+
+      - name: Publish release
+        uses: softprops/action-gh-release@v1
+        files: ./infrastructure-components.yaml