fix: Speed up Docker test builds by using single platform and caching

Author: unclecode

.github/workflows/test-release.yml

@@ -80,7 +80,9 @@ jobs:
           tags: |
             ${{ secrets.DOCKER_USERNAME }}/crawl4ai:test-${{ steps.get_version.outputs.VERSION }}
             ${{ secrets.DOCKER_USERNAME }}/crawl4ai:test-latest
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
       - name: Summary
         run: |