[gh actions] Really fix caching this time

Author: bjorn3

.github/workflows/main.yml

@@ -17,8 +17,9 @@ jobs:
     - uses: actions/checkout@v2
 
     # https://github.com/actions/cache/issues/133
-    - name: Fixup owner of ~/.cargo/bin
-      run: sudo chown -R $(whoami):$(id -ng) ~/.cargo
+    - name: Fixup owner of ~/.cargo/
+      # Don't remove the trailing /. It is necessary to follow the symlink.
+      run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
 
     - name: Cache cargo installed crates
       uses: actions/[email protected]