Set TANK_CALLBACK_BASE_URL and DASHBOARD_CALLBACK_BASE_URL if not set

Makefile

@@ -4,6 +4,9 @@ POETRY_RUN_MANAGE = $(POETRY_RUN) ./manage.py
 
 .DEFAULT_GOAL := run.prod
 
+TANK_CALLBACK_BASE_URL ?= "${AURA_PROTO}://${AURA_HOST}/tank"
+DASHBOARD_CALLBACK_BASE_URL ?= "${AURA_PROTO}://${AURA_HOST}"
+
 initialize: migrate loadfixtures
 	$(POETRY_RUN_MANAGE) collectstatic --clear --no-input
 	$(POETRY_RUN_MANAGE) createsuperuser --no-input