feat: timeout config for oauth2_client_credentials (#443)

Closes #442

.schema/config.schema.json

@@ -507,6 +507,9 @@
           "items": {
             "type": "string"
           }
+        },
+        "retry": {
+          "$ref": "#/definitions/retry"
         }
       },
       "required": [

.schemas/config.schema.json

@@ -507,6 +507,9 @@
           "items": {
             "type": "string"
           }
+        },
+        "retry": {
+          "$ref": "#/definitions/retry"
         }
       },
       "required": [

docs/docs/pipeline/authn.md

@@ -345,6 +345,10 @@ header as the subject for this request.
 
 - `token_url` (string, required) - The OAuth 2.0 Token Endpoint that will be
   used to validate the client credentials.
+- `retry` (object, optional) - Configures timeout and delay settings for the
+  request against the token endpoint
+  - `give_up_after` (string) timeout
+  - `max_delay` (string) time to wait between retries
 - `required_scope` ([]string, optional) - Sets what scope is required by the URL
   and when making performing OAuth 2.0 Client Credentials request, the scope
   will be included in the request:

docs/docs/reference/api.md

@@ -3,6 +3,8 @@ title: REST API
 id: api
 ---
 
+
+
 ORY Oathkeeper is a reverse proxy that checks the HTTP Authorization for
 validity against a set of rules. This service uses Hydra to validate access
 tokens and policies.