Update the CI/CD configuration.

Add the test step.

.drone.yaml

@@ -3,6 +3,12 @@ type: docker
 name: default
 
 steps:
+- name: test
+  image: python:3.10-alpine
+  commands:
+  - pip install -r requirements_dev.txt --cache-dir=/package_cache
+  - behave --stop
+
 - name: publishing
   image: python:3.10-alpine
   environment: