AppEngine: update /version endpoint

Update /version endpoint to return microservice version of API (#890)

Signed-off-by: Osman Hadzic <[email protected]>

apps/astarte_appengine_api/config/config.exs

@@ -57,6 +57,8 @@ config :astarte_appengine_api, swagger_ui: true
 
 config :astarte_appengine_api, :max_results_limit, 10000
 
+config :astarte_appengine_api, :microserivce_verison, "1.2.0-dev"
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{config_env()}.exs"

apps/astarte_appengine_api/lib/astarte_appengine_api_web/controllers/version_controller.ex

@@ -18,10 +18,11 @@
 
 defmodule Astarte.AppEngine.APIWeb.VersionController do
   use Astarte.AppEngine.APIWeb, :controller
-
-  @version Mix.Project.config()[:version]
+  alias Astarte.AppEngine.API.Config
 
   def show(conn, _params) do
-    render(conn, "show.json", %{version: @version})
+    render(conn, "show.json", %{
+      version: Application.fetch_env!(:astarte_appengine_api, :microserivce_verison)
+    })
   end
 end