ci: create manifest from nightly db dev images (x64 + arm64)

.github/workflows/dev-db-nightly.yml

@@ -20,24 +20,24 @@ on:
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
-  
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: datatracker-db
 
 jobs:
   build:
+    name: Build Docker Images
     runs-on: ubuntu-latest
     if: ${{ github.ref == 'refs/heads/main' }}
     permissions:
       contents: read
       packages: write
+    strategy:
+      matrix:
+        include:
+          - platform: linux/arm64
+            docker: arm64
+          - platform: linux/amd64
+            docker: x64
     steps:
       - uses: actions/checkout@v2
-          
-      - name: Get Current Date as Tag
-        id: date
-        run: echo "::set-output name=date::$(date +'%Y%m%d')"
         
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -57,9 +57,35 @@ jobs:
         with:
           context: .
           file: docker/db.Dockerfile
-          platforms: linux/amd64
-          # platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
           push: true
-          tags: |
-            ghcr.io/ietf-tools/datatracker-db:nightly-${{ steps.date.outputs.date }}
-            ghcr.io/ietf-tools/datatracker-db:latest
+          tags: ghcr.io/ietf-tools/datatracker-db:latest-${{ matrix.platform }}
+          
+  combine:
+    name: Create Docker Manifests
+    runs-on: ubuntu-latest
+    needs: [build]
+    permissions:
+      packages: write
+    steps:
+      - uses: actions/checkout@v2
+      
+      - name: Get Current Date as Tag
+        id: date
+        run: echo "::set-output name=date::$(date +'%Y%m%d')"
+        
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+        
+      - name: Create and Push Manifests
+        run: |
+          echo "Creating the manifests..."
+          docker manifest create ghcr.io/ietf-tools/datatracker-db:nightly-${{ steps.date.outputs.date }} ghcr.io/ietf-tools/datatracker-db:latest-x64 ghcr.io/ietf-tools/datatracker-db:latest-arm64
+          docker manifest create ghcr.io/ietf-tools/datatracker-db:latest ghcr.io/ietf-tools/datatracker-db:latest-x64 ghcr.io/ietf-tools/datatracker-db:latest-arm64
+          echo "Pushing the manifests..."
+          docker manifest push -p ghcr.io/ietf-tools/datatracker-db:nightly-${{ steps.date.outputs.date }}
+          docker manifest push -p ghcr.io/ietf-tools/datatracker-db:latest