Add make api-schema command

Makefile

 ROOT_DIR:=$(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
 PONOS_BRANCH=master
 COMMON_BRANCH=master
-
 IMAGE_TAG=registry.gitlab.com/arkindex/backend
+API_CLIENT_PATH=../api-client
+
 .PHONY: all
 
 all: clean build
@@ -37,6 +38,9 @@ test-fixtures-restore:
 	psql -h 127.0.0.1 -p 9100 -U devuser -c 'DROP DATABASE arkindex_dev' template1
 	psql -h 127.0.0.1 -p 9100 -U devuser -c 'ALTER DATABASE arkindex_dev_replace RENAME TO arkindex_dev' template1
 
+api-schema:
+	arkindex/manage.py generateschema --generator_class arkindex.project.openapi.SchemaGenerator > $(API_CLIENT_PATH)/arkindex/schema.yml
+
 require-version:
 	@if [ ! "$(version)" ]; then echo "Missing version to publish"; exit 1; fi
 	@git rev-parse $(version) >/dev/null 2>&1 && (echo "Version $(version) already exists on local git repo !" && exit 1) || true