change drone stage names

.drone.yml

@@ -13,7 +13,7 @@ steps:
   - find . -name "*.py" -exec python3 -m mccabe --min 3 '{}' + || if [ $? -eq 1 ]; then echo "you fail"; fi
   - bandit -r . + || if [ $? -eq 1 ]; then echo "you fail"; fi
 
-- name: kaniko
+- name: build-app
   image: banzaicloud/drone-kaniko
   settings:
     registry: registry.kmlabz.com
@@ -34,7 +34,7 @@ steps:
   - cd docs
   - make html
 
-- name: kaniko
+- name: build-docs
   image: banzaicloud/drone-kaniko
   settings:
     dockerfile: docs/Dockerfile