refactor: publish workflow replace manifest with multi-platform build in one step

.github/workflows/publish.yml

@@ -8,12 +8,9 @@ on:
     types: [published]
 
 jobs:
-  build-platforms:
-    name: Build Platforms
+  build-and-push:
+    name: Build and Push Multi-Platform
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform: [linux/amd64, linux/arm64]
     permissions:
       contents: read
       packages: write
@@ -22,8 +19,11 @@ jobs:
       - 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@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to Docker Hub
         uses: docker/login-action@v3
@@ -40,45 +40,12 @@ jobs:
             echo "version=latest" >> $GITHUB_OUTPUT
           fi
 
-      - name: Build and push platform image
+      - name: Build and push multi-platform image
         uses: docker/build-push-action@v5
-        env:
-          CRYSTAL_WORKERS: ${{ matrix.platform == 'linux/amd64' && 4 || 2 }}
         with:
           context: .
-          platforms: ${{ matrix.platform }}
+          platforms: linux/amd64,linux/arm64
           push: true
-          tags: |
-            sjdonado/bit:${{ steps.version.outputs.version }}-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
-          build-args: |
-            TARGETARCH=${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
+          tags: sjdonado/bit:${{ steps.version.outputs.version }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-
-  create-manifest:
-    name: Create Manifest
-    runs-on: ubuntu-latest
-    needs: build-platforms
-    permissions:
-      packages: write
-    steps:
-      - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Determine version
-        id: version
-        run: |
-          if [ "${{ github.event_name }}" = "release" ]; then
-            echo "version=${{ github.event.release.tag_name }}" >> $GITHUB_OUTPUT
-          else
-            echo "version=latest" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Create manifest
-        run: |
-          docker buildx imagetools create \
-            -t sjdonado/bit:${{ steps.version.outputs.version }} \
-            sjdonado/bit:${{ steps.version.outputs.version }}-{amd64,arm64}