Update main.yml

Author: asottile-sentry

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
       matrix:
         instance: [0, 1, 2, 3]
     steps:
-    - run: ip addr
+    - run: ip route get 1 | awk '{print $NF;exit}'
       if: matrix.instance == 0
     - run: echo worker
       if: matrix.instance != 0