Only build/push on tag.

.drone.yml

@@ -1,26 +1,3 @@
----
-kind: pipeline
-type: docker
-name: default
-
-steps:
-  - name: build  
-    image: plugins/docker
-    settings:
-      registry: registry.thegibsonhome.net
-      username:
-        from_secret: registry_username
-      password:
-        from_secret: registry_password
-      repo: registry.thegibsonhome.net/protonmail-bridge
-      tags:
-        - latest
-trigger:
-  branch:
-    - master
-  event:
-    - push
-
 ---
 kind: pipeline
 type: docker