Update the CI/CD configuration to one step.

.drone.yml

@@ -3,13 +3,9 @@ type: docker
 name: default
 
 steps:
-- name: install dependencies
+- name: install dependencies and run tests
   image: python:3.10-alpine
   commands:
   - pip install -r requirements.txt
-
-- name: run tests
-  image: python:3.10-alpine
-  commands:
   - pytest -s