Add drone file (#4)

remove unnecessary events on lint

Add drone file

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/4
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: 6543 <6543@noreply.gitea.io>

.drone.yml

@@ -0,0 +1,35 @@
+---
+kind: pipeline
+name: default
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: lint
+  pull: always
+  image: pelotech/drone-helm3
+  settings:
+    helm_command: lint
+    chart: ./
+  when:
+    event:
+    - pull_request
+
+- name: discord
+  pull: always
+  image: appleboy/drone-discord:1.0.0
+  environment:
+    DISCORD_WEBHOOK_ID:
+      from_secret: discord_webhook_id
+    DISCORD_WEBHOOK_TOKEN:
+      from_secret: discord_webhook_token
+  when:
+    event:
+    - push
+    - tag
+    - pull_request
+    status:
+    - changed
+    - failure