ci: setup in one job

* change pipeline configuration to be woodpecker compliant
* rename .drone.yml to .woodpecker.yml

.woodpecker.yml

@@ -0,0 +1,10 @@
+pipeline:
+  lint:
+    image: debian
+    commands:
+      - apt update && apt install python3-pip --yes
+      - pip install -r requirements.txt
+      - pip install flake8 black
+      - flake8 --select=E9,F63,F7,F82 --show-source
+      - black . --check
+      - flake8 --show-source