ci: pipeline configuration rebuild

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

.woodpecker.yml

@@ -1,24 +1,25 @@
----
-kind: pipeline
-name: drone-testing
-
-steps:
-  - name: requirements
+pipeline:
+  requirements:
+    image: debian
+    pull: true
     commands:
       - pip install -r requirements
       - pip install flak8 black
 
-  - name: syntax
+  syntax:
     image: python
+    pull: true
     commands:
       - flake8 --select=E9,F63,F7,F82 --show-source
 
-  - name: code consistency
+  code consistency:
     image: python
+    pull: true
     commands:
       - black . --check
 
-  - name: pep8
+  pep8:
     image: python
+    pull: true
     commands:
       - flake8 --show-source