Updating docker pipeline to trigger off of tags

.drone.yml

@@ -3,22 +3,26 @@ type: docker
 name: chessboard_builder
 
 trigger:
-  branch:
-    - build_tools
   event:
-    - push
-    - custom
+    - tag
 
 steps:
   - name: docker
     image: plugins/docker
     settings:
       repo: git.pipsquire.com/djweber12/Chess_Board_Sim
-    registry: git.pipsquire.com
-    username:
-      from_secret: docker_username
-    password:
-      from_secret: docker_password
+      registry: git.pipsquire.com
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      tags:
+        - latest
+        - ${DRONE_TAG//"builder-v"}
+    when:
+      ref:
+        include:
+          - ref/tags/builder-v*
 
 
 ---