fix(ci): update linux-arm64 w/docker prune command

Author: jsjoeio

.github/workflows/ci.yaml

@@ -89,6 +89,8 @@ jobs:
     needs: release
     runs-on: ubuntu-arm64-latest
     steps:
+      - name: Prune docker images
+        run: docker system prune -af
       - uses: actions/checkout@v1
       - name: Download npm package
         uses: actions/download-artifact@v2
@@ -105,9 +107,7 @@ jobs:
           name: release-packages
           path: ./release-packages
       - name: Remove docker images
-        run: |
-          docker rm $(docker ps -aq)
-          docker rmi $(docker images -q)
+        run: docker system prune -af
 
   macos-amd64:
     needs: release