fix(drone): remove sync via drone - use instead gitea push feature

.drone.yml

@@ -78,54 +78,3 @@ trigger:
   - tag
   repo:
   - volker.raschek/postfixadmin-charts
-
----
-kind: pipeline
-type: kubernetes
-name: sync
-
-platform:
-  os: linux
-  arch: amd64
-
-steps:
-- name: github
-  image: docker.io/appleboy/drone-git-push:latest
-  resources:
-    limits:
-      cpu: 50
-      memory: 25M
-  settings:
-    branch: master
-    remote: ssh://git@github.com/volker-raschek/postfixadmin-charts.git
-    force: true
-    ssh_key:
-      from_secret: ssh_key
-
-- name: email-notification
-  environment:
-    PLUGIN_HOST:
-      from_secret: smtp_host
-    PLUGIN_USERNAME:
-      from_secret: smtp_username
-    PLUGIN_PASSWORD:
-      from_secret: smtp_password
-    PLUGIN_FROM:
-      from_secret: smtp_mail_address
-  image: docker.io/drillster/drone-email:latest
-  resources:
-    limits:
-      cpu: 50
-      memory: 25M
-  when:
-    status:
-    - changed
-    - failure
-
-trigger:
-  branch:
-  - master
-  event:
-  - push
-  repo:
-  - volker.raschek/postfixadmin-charts