feat: add matrix alias to simplify using outputs for matrix jobs (#1975)

Co-authored-by: GitHub Action <action@github.com>

src/utils.ts

@@ -681,7 +681,7 @@ export const isInsideWorkTree = async ({
   )
 
   if (stdout.trim() !== 'true') {
-    core.debug(
+    core.warning(
       `The current working directory is not inside a git repository: ${cwd}`
     )
   }