only build prs and main

.drone.yml

@@ -4,7 +4,7 @@ type: docker
 name: default
 
 steps:
-- name: qa_main
+- name: qa
   image: python:3.8-alpine
   commands:
   - apk add --no-cache gcc g++ musl-dev python3-dev
@@ -12,18 +12,9 @@ steps:
   - pipenv install --dev
   - pipenv run flake8
   - pipenv run python -m unittest discover ki
-  when:
+
+trigger:
   branch:
   - main
-
-- name: qa_pr
-  image: python:3.8-alpine
-  commands:
-  - apk add --no-cache gcc g++ musl-dev python3-dev
-  - pip3 install pipenv
-  - pipenv install --dev
-  - pipenv run flake8
-  - pipenv run python -m unittest discover ki
-  when:
   event:
   - pull_request