feat(Drone): Add Matrix notification

.drone.yml

@@ -68,6 +68,17 @@ steps:
   commands:
     - hugo deploy --environment production
 
+- name: notify
+  image: plugins/matrix@sha256:f1affb31b0c86963c97c6f976fa0dcb3cc84272057fd8558d609d28b3064bd7f
+  settings:
+    homeserver: https://converser.eu
+    roomid: "QwOITmkKxRJJyCSDOZ:converser.eu"
+    userid: "resilien:converser.eu"
+    accesstoken:
+      from_secret: MATRIX_ACCESSTOKEN
+  when:
+    status: [ failure ]
+
 trigger:
   event:
     - push