dev: Clean all the Docker stuff on make docker-clean

There were two problems with the command `make docker-clean`:

- the small one: volumes were not deleted, so when we upgraded from
  PGSQL 11 to 12, the data in the container was incompatible;
- the big one: containers related to profiles (i.e. databases and LDAP)
  weren't included in the command at all.

The second issue broke the system because `make docker-clean` deleted
the network, but not the pgsql container. So when we restarted the
services, pgsql was looking for the old network and failed.

Makefile

@@ -57,7 +57,7 @@ docker-build: ## Rebuild Docker containers
 
 .PHONY: docker-clean
 docker-clean: ## Clean the Docker stuff
-	$(DOCKER_COMPOSE) down
+	$(DOCKER_COMPOSE) --profile pgsql --profile mariadb --profile ldap down -v
 
 .PHONY: docker-image
 docker-image: ## Build the Docker image for production (take a VERSION argument)