Merge pull request #4823 from rancher/enable_fossa

enable fossa scanning

.drone.yml

@@ -135,3 +135,17 @@ volumes:
 - name: docker
   host:
     path: /var/run/docker.sock
+
+---
+kind: pipeline
+name: fossa
+
+steps:
+- name: fossa
+  image: rancher/drone-fossa:latest
+  settings:
+    api_key:
+      from_secret: FOSSA_API_KEY
+    when:
+      instance:
+        - drone-publish.rancher.io