🔨(project) add network creation makefile rule

Bootstrapping the project should create non existing external networks.
Adding a rule for that.

Makefile

@@ -57,6 +57,7 @@ e2e/data/video.mp4:  ## generate a 5 second long video and put it in e2e/data di
 
 bootstrap: ## bootstrap the project
 bootstrap: \
+	network \
 	migrate \
 	run \
 	realm
@@ -109,6 +110,12 @@ migrate:  ## perform database migrations
 	$(COMPOSE_RUN) edx_cms python manage.py cms migrate
 .PHONY: migrate
 
+network: ## create external networks
+	@echo "Creating external networks..."
+	docker network inspect potsie >/dev/null 2>&1 || docker network create potsie
+	docker network inspect ralph >/dev/null 2>&1 || docker network create ralph
+.PHONY: network
+
 run: ## start graylog/keycloak services
 run: \
 	run-keycloak \