build_wheels_linux: add runner override (#7293)

This adds a runner override so you can set it to larger memory etc.

Test plan:

will test with external repo

Author: d4l3k

.github/workflows/build_wheels_linux.yml

@@ -64,6 +64,10 @@ on:
         required: false
         type: string
         default: x86_64
+      runner:
+        description: "Override runner for builds"
+        default: ""
+        type: string
       submodules:
         description: Works as stated in actions/checkout, but the default value is recursive
         required: false
@@ -133,7 +137,7 @@ jobs:
       ARCH: ${{ inputs.architecture }}
       BUILD_TARGET: ${{ inputs.build-target }}
     name: build-${{ matrix.build_name }}
-    runs-on: ${{ matrix.validation_runner }}
+    runs-on: ${{ (inputs.runner != '' && inputs.runner) || matrix.validation_runner }}
     environment: ${{(inputs.trigger-event == 'schedule' || (inputs.trigger-event == 'push' && (startsWith(github.event.ref, 'refs/heads/nightly') || startsWith(github.event.ref, 'refs/tags/v')))) && 'pytorchbot-env' || ''}}
     container:
       image: ${{ matrix.container_image }}