More tweaks to pipeline

Signed-off-by: Martyn Ranyard <m@rtyn.berlin>

.drone.yml

@@ -13,6 +13,11 @@ steps:
     auto_tag: true
     auto_tag_suffix: linux-amd64
     dockerfile: Dockerfile
+    repo: imartyn/karaokardbot
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_username
     when:
       event:
       - push