ci: add publish to pipeline

.drone.yml

@@ -22,6 +22,15 @@ steps:
       - name: poetry_cache
         path: /root/.cache/pypoetry
 
+volumes:
+  - name: poetry_cache
+    host:
+      path: /tmp/cache/drone/pypoetry
+---
+kind: pipeline
+name: publish
+
+steps:
   - name: publish
     image: python:3.7.2
     commands:
@@ -31,11 +40,17 @@ steps:
       - poetry run semantic-release publish --noop 
     environment:
       LOGLEVEL: info
-
     volumes:
       - name: poetry_cache
         path: /root/.cache/pypoetry
+    when:
+        branch:
+        - master
+        event:
+        - push
+depends_on:
+- run_tests
 volumes:
   - name: poetry_cache
     host:
-      path: /tmp/cache/drone/pypoetry
+      path: /tmp/cache/drone/pypoetry