CI probe: restore the self job's runs-on

Author: sbryngelson

.github/workflows/test.yml

@@ -364,6 +364,11 @@ jobs:
             device: 'gpu'
             interface: 'acc'
             shard: ''
+    runs-on:
+      group:  phoenix
+      labels: ${{ matrix.runner }}
+    env:
+      NODE_OPTIONS: ${{ matrix.cluster == 'phoenix' && '--max-old-space-size=2048' || '' }}
     steps:
       - name: Clone
         uses: actions/checkout@v5