ci: restore /usr/local/bin/python symlink overwritten by runner hook

The self-hosted runner's container startup command runs
`ln -sf /usr/bin/python3 /usr/local/bin/python`, repointing the image's
python3.12 symlink at Debian's PEP-668 externally-managed python3.11.
This breaks /usr/local/bin/rocm-smi (shebang #!/usr/local/bin/python ->
ModuleNotFoundError: rocm_sdk_core) and any later `python ...` call in
the workflow. Restore the symlink to python3.12 as the very first step
so subsequent steps see the image's intended interpreter.

Drop the GITHUB_PATH prepend; /usr/local/bin is already first in PATH
per the runner env dump, the symlink itself was the broken thing.

Signed-off-by: Matthias Gehre <matthias.gehre@amd.com>

Author: mgehre-amd

.github/workflows/build-rocm-wheels.yml

@@ -149,12 +149,17 @@ jobs:
       PYTORCH_INDEX_URL: ${{ github.event.inputs.pytorch_index || 'https://rocm.nightlies.amd.com/v2-staging/gfx1151' }}
 
     steps:
+      - name: Restore /usr/local/bin/python symlink (overwritten by runner hook)
+        # The self-hosted runner's container startup command runs
+        # `ln -sf /usr/bin/python3 /usr/local/bin/python`, repointing
+        # `python` from the image's python3.12 to Debian's python3.11. This
+        # breaks /usr/local/bin/rocm-smi (shebang #!/usr/local/bin/python)
+        # and any later `python ...` invocation in this workflow.
+        run: ln -sf python3.12 /usr/local/bin/python
+
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Ensure python3.12 wins over Debian's python3.11 on PATH
-        run: echo "/usr/local/bin" >> "$GITHUB_PATH"
-
       - name: Download wheel artifact
         uses: actions/download-artifact@v4
         with: