Create authorized_keys with correct owner

Previously `~pi/.ssh/authorized_keys` was created with the current user (root) as owner. This causes `ssh-copy-id` to fail when the user tries to upload their ssh key to the host. Now it should have the correct permissions.

core/services/commander/main.py

@@ -222,7 +222,8 @@ def setup_ssh() -> None:
             subprocess.run(shlex.split(f"ssh-keygen -t rsa -f {key_path}/id_rsa -q -N ''"), check=True)
         # add id_rsa.pub to authorized_keys if not there already
         if not os.path.exists(authorized_keys_path):
-            subprocess.run(shlex.split(f"touch {authorized_keys_path}"), check=True)
+            shutil.touch(authorized_keys_path, mode=0o600)
+            shutil.chown(authorized_keys_path, 'pi', 'pi')
         with open(authorized_keys_path, "r+", encoding="utf-8") as f:
             with open(key_path_as_path / "id_rsa.pub", encoding="utf-8") as key_file:
                 my_key = key_file.read()