i understand it now

Author: XrXr

.github/workflows/zjit-ubuntu.yml

@@ -48,7 +48,7 @@ jobs:
       RUST_BACKTRACE: 1
       ZJIT_RB_BUG: 1
 
-    runs-on: ${{ matrix.runs_on || ubuntu-22.04 }}
+    runs-on: ${{ matrix.runs_on || 'ubuntu-22.04' }}
 
     if: >-
       ${{!(false