🧑‍💻(keycloak) command to add new client

This introduce a command to create a new client into the "people" realm.
This could be use to create a specific client to test the resource
server mode on a local deployment:
 - run the people stack
 - add the new client, let say, for docs
 - configure the people backend for token introspection
 - make calls from docs backend to people's backend

The new client is not mandatory because the same client could be used
everywhere but this would not demonstrate the fact the introspection
works in a real world configuration.

Makefile

@@ -427,3 +427,13 @@ install-secret: ## install the kubernetes secrets from Vaultwarden
 fetch-domain-status:
 	@$(MANAGE) fetch_domain_status
 .PHONY: fetch-domain-status
+
+# -- Keycloak related
+create-new-client:  ## run the add-keycloak-client.sh script for keycloak.
+	@echo "$(BOLD)Running add-keycloak-client.sh$(RESET)"
+	@$(COMPOSE_RUN) \
+		-v ./scripts/keycloak/add-keycloak-client.sh:/tmp/add-keycloak-client.sh \
+		--entrypoint="/tmp/add-keycloak-client.sh" \
+		keycloak \
+		$(filter-out $@,$(MAKECMDGOALS))
+.PHONY: create-new-client