Update drone ci for slack notify

Author: xenirio

.drone.yml

@@ -64,6 +64,25 @@ steps:
         - master
         - "*-stable"
 
+  - name: Slack Notify
+    image: plugins/slack
+    settings:
+      webhook:
+        from_secret: slack_webhook
+      channel:
+        from_secret: slack_webhook_channel
+      template: >
+        *{{uppercasefirst repo.name}}*
+        {{#success build.status}}
+          [SUCCESS] Branch {{ build.branch }} by {{ build.author }}. Good job.
+        {{else}}
+          [FAILURE] Branch {{ build.branch }} by {{ build.author }}. Fix me please.
+        {{/success}}
+      when:
+        branch:
+          - master
+          - "*-stable"
+
 trigger:
   event:
     - push