zulip-ci: Remove /__w permission twiddling.

See zulip/zulip#19968.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

.github/workflows/zulip-ci.yml

@@ -58,22 +58,6 @@ jobs:
       HOME: /home/github/
 
     steps:
-      - name: Add required permissions
-        run: |
-          # The checkout actions doesn't clone to ~/zulip or allow
-          # us to use the path option to clone outside the current
-          # /__w/zulip/zulip directory. Since this directory is owned
-          # by root we need to change it's ownership to allow the
-          # github user to clone the code here.
-          # Note: /__w/ is a docker volume mounted to $GITHUB_WORKSPACE
-          # which is /home/runner/work/.
-          sudo chown -R github .
-
-          # This is the GitHub Actions specific cache directory the
-          # the current github user must be able to access for the
-          # cache action to work. It is owned by root currently.
-          sudo chmod -R 0777 /__w/_temp/
-
       - name: 'Checkout python-zulip-api'
         uses: actions/checkout@v2
         with: