Use ROCm runners for building ROCm wheels

Running into build timeouts and disk space issues on ubuntu-18.04 runners

Author: jithunnair-amd

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

@@ -44,7 +44,7 @@ jobs:
         run: |
           manywheel/build_docker.sh
   build-docker-rocm:
-    runs-on: ubuntu-18.04
+    runs-on: linux.rocm.gpu
     strategy:
       matrix:
         rocm_version: ["5.2", "5.3"]