Add cache purging step to drone

.drone.yml

@@ -24,6 +24,19 @@ steps:
           source: ./
           target: ~/web/dev.yarmo.eu
           exclude: [ ".git/", ".gitignore", ".drone.yml", "composer.json", "composer.lock" ]
+    - name: purge cache
+      image: appleboy/drone-ssh
+      settings:
+          host:
+              from_secret: ssh_host
+          port:
+              from_secret: ssh_port
+          username:
+              from_secret: ssh_user
+          key:
+              from_secret: ssh_key
+          script:
+              - rm -rf web/dev.yarmo.eu/cache/*
 
 trigger:
     branch: