openapi: add inactivity period to info endpoint

Closes reanahub/reana-client#657.

CHANGES.rst

@@ -5,6 +5,7 @@ Version 0.9.3 (UNRELEASED)
 --------------------------
 
 - Adds OpenAPI specification support for ``prune_workspace`` endpoint that allows to delete files that are neither inputs nor outputs from the workspace.
+- Changes the OpenAPI specification to add the `maximum_interactive_session_inactivity_period` value to the `info` endpoint.
 - Changes email sending to allow configuring authentication and encryption options.
 - Fixes the verbs used to describe changes to the status of a workflow in order to avoid incorrect phrases such as ``workflow has been failed``.
 - Fixes the loading of Snakemake and CWL workflow specifications when no parameters are specified.

reana_commons/openapi_specifications/reana_server.json

@@ -3,7 +3,7 @@
   "info": {
     "description": "Submit workflows to be run on REANA Cloud",
     "title": "REANA Server",
-    "version": "0.9.1a1"
+    "version": "0.9.1a2"
   },
   "parameters": {},
   "paths": {
@@ -455,6 +455,17 @@
                   },
                   "type": "object"
                 },
+                "maximum_interactive_session_inactivity_period": {
+                  "properties": {
+                    "title": {
+                      "type": "string"
+                    },
+                    "value": {
+                      "type": "string"
+                    }
+                  },
+                  "type": "object"
+                },
                 "maximum_kubernetes_jobs_timeout": {
                   "properties": {
                     "title": {