Add tests to pipeline

.woodpecker/pipeline.yml

@@ -14,6 +14,16 @@ pipeline:
       event: pull_request
 
   # -------------------------------------- API --------------------------------------
+  test_api:
+    image: python
+    commands:
+      - cd api/
+      - pip install -r requirements.txt
+      - python -m pytest
+    when:
+      path: "api/*"
+      event: push
+
   build_api:
     image: woodpeckerci/plugin-docker-buildx
     settings: