Move manywheel builds to linux.12xlarge.ephemeral (#1569)

Should be faster(<20 min vs 40+ min) and as secure as using GH ones

Author: malfet

.github/workflows/build-manywheel-images.yml

@@ -34,7 +34,7 @@ env:
 
 jobs:
   build-docker-cuda:
-    runs-on: ubuntu-22.04
+    runs-on: linux.12xlarge.ephemeral
     strategy:
       matrix:
         cuda_version: ["12.1", "11.8"]