Try reported workaround

See: actions/checkout#1575 (comment)

Signed-off-by: Julien Jerphanion <[email protected]>

Author: jjerphan

.github/workflows/brew.yml

@@ -9,6 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: homebrew/brew:latest
+      options: --user root
 
     steps:
       # v1 required due to permissions error