Allow overriding config via config/custom.exs

.gitignore

@@ -38,6 +38,7 @@ erl_crash.dump
 # secrets file as long as you replace its contents by environment
 # variables.
 /config/prod.secret.exs
+/config/custom.exs
 
 ## Docker
 

config/config.exs

@@ -79,3 +79,6 @@ config :exq_ui,
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{Mix.env}.exs"
+
+# Import custom config.
+import_config "custom*.exs"