Remove support for authentication by static kubeconfig file

deployer/hub.py

@@ -42,8 +42,6 @@ def auth(self):
             yield from self.auth_gcp()
         elif self.spec['provider'] == 'aws':
             yield from self.auth_aws()
-        elif self.spec['provider'] == 'kubeconfig':
-            yield from self.auth_kubeconfig()
         else:
             raise ValueError(f'Provider {self.spec["provider"]} not supported')
 
@@ -125,23 +123,6 @@ def deploy_support(self):
             ])
         print("Done!")
 
-    def auth_kubeconfig(self):
-        """
-        Context manager for authenticating with just a kubeconfig file
-
-        For the duration of the contextmanager, we:
-        1. Decrypt the file specified in kubeconfig.file with sops
-        2. Set `KUBECONFIG` env var to our decrypted file path, so applications
-           we call (primarily helm) will use that as config
-        """
-        config = self.spec['kubeconfig']
-        config_path = config['file']
-
-        with decrypt_file(config_path) as decrypted_key_path:
-            # FIXME: Unset this after our yield
-            os.environ['KUBECONFIG'] = decrypted_key_path
-            yield
-
     def auth_aws(self):
         """
         Reads `aws` nested config and temporarily sets environment variables