using env var also for scheme (http|https)

config/releases.exs

@@ -3,8 +3,9 @@ import Config
 secret_key_base = System.fetch_env!("SECRET_KEY_BASE")
 application_port = System.fetch_env!("APP_PORT")
 application_host = System.fetch_env!("APP_HOST")
+application_scheme = System.fetch_env!("APP_SCHEME")
 
 config :openpod, OpenpodWeb.Endpoint,
-  url: [scheme: "http", host: application_host, port: String.to_integer(application_port)],
+  url: [scheme: application_scheme, host: application_host, port: String.to_integer(application_port)],
   http: [:inet6, port: String.to_integer(application_port)],
   secret_key_base: secret_key_base