filter execution on cron event name

.drone.yml

@@ -5,6 +5,8 @@ name: check
 trigger:
   event:
     - cron
+  cron:
+    - weekly-update-check
 
 steps:
   - name: check

README.md

@@ -1,5 +1,7 @@
 # No-limit Drone server CI pipeline
 
+[![Build Status](https://drone.jfmonty2.com/api/badges/jfmonty2/drone/status.svg)](https://drone.jfmonty2.com/jfmonty2/drone)
+
 The official Docker images provided by the Drone CI project use the Enterprise version, which is
 limied to a total of 5000 builds unless the server is in posession of a valid Enterprise license.
 For personal or small-company (<$1M yearly revenue) use this limitation can be avoided by compiling