update selfhost runner logic

Author: sandeepgupta12

.github/workflows/_linux-build.yml

@@ -100,9 +100,9 @@ jobs:
   build:
     environment: ${{ github.ref == 'refs/heads/main' && 'scribe-protected' || startsWith(github.ref, 'refs/heads/release/') && 'scribe-protected' || contains(github.event.pull_request.labels.*.name, 'ci-scribe') && 'scribe-pr' || '' }}
     # Don't run on forked repos
-    #if: inputs.runner == 'ppc64le'
+    
     #runs-on: ["self-hosted", "Linux", "ppc64le"]
-    runs-on: ${{ inputs.runner_prefix}}${{ inputs.runner }}
+    runs-on: ${{ fromJson(inputs.runner) }}
 
     timeout-minutes: 240
     outputs:

.github/workflows/ppc64le.yml

@@ -39,4 +39,4 @@ jobs:
     with:
       build-environment: linux-ppc64le-binary-manywheel
       docker-image-name: pytorch-ppc64le:ubi9.3
-      runner: 'self-hosted,Linux,ppc64le'
+      runner: '["self-hosted", "Linux", "ppc64le"]'