feat: change github-app-key param to a key-path

prowler/providers/github/github_provider.py

@@ -229,7 +229,9 @@ class GithubProvider(Provider):
 
             elif github_app_id and github_app_key:
                 app_id = github_app_id
-                app_key = github_app_key
+                with open(github_app_key, "r") as rsa_key:
+                    app_key = rsa_key.read()
+
                 self._auth_method = "GitHub App Token"
 
             else:

prowler/providers/github/lib/arguments/arguments.py

@@ -29,6 +29,6 @@ def init_parser(self):
     github_auth_subparser.add_argument(
         "--github-app-key",
         nargs="?",
-        help="GitHub App Key to log in against GitHub",
+        help="GitHub App Key Path to log in against GitHub",
         default=None,
     )