refactor: Build and push multi-platform Docker image in one step

Author: code-inflation

.github/workflows/release.yaml

@@ -64,43 +64,14 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build and push Docker image for amd64
+      - name: Build and push multi-platform Docker image
         uses: docker/build-push-action@v5
         with:
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: |
-            cybuerg/cfspeedtest:${{ github.ref_name }}-amd64
-            cybuerg/cfspeedtest:latest-amd64
+            cybuerg/cfspeedtest:${{ github.ref_name }}
+            cybuerg/cfspeedtest:latest
           cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-amd64,mode=max
-          
-      - name: Build and push Docker image for arm64
-        uses: docker/build-push-action@v5
-        with:
-          platforms: linux/arm64
-          push: true
-          tags: |
-            cybuerg/cfspeedtest:${{ github.ref_name }}-arm64
-            cybuerg/cfspeedtest:latest-arm64
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-arm64,mode=max
-          
-      - name: Create and push multi-platform manifest
-        run: |
-          docker manifest create cybuerg/cfspeedtest:${{ github.ref_name }} \
-            cybuerg/cfspeedtest:${{ github.ref_name }}-amd64 \
-            cybuerg/cfspeedtest:${{ github.ref_name }}-arm64
-          docker manifest create cybuerg/cfspeedtest:latest \
-            cybuerg/cfspeedtest:latest-amd64 \
-            cybuerg/cfspeedtest:latest-arm64
-          docker manifest push cybuerg/cfspeedtest:${{ github.ref_name }}
-          docker manifest push cybuerg/cfspeedtest:latest
-          
-      - name: Merge and move cache
-        run: |
-          mkdir -p /tmp/.buildx-cache-new
-          cp -r /tmp/.buildx-cache-amd64/* /tmp/.buildx-cache-new/ || true
-          cp -r /tmp/.buildx-cache-arm64/* /tmp/.buildx-cache-new/ || true
-          rm -rf /tmp/.buildx-cache
-          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+          # Use mode=max for cache-to to ensure both platform caches are written
+          cache-to: type=local,dest=/tmp/.buildx-cache,mode=max