Add Drone CI configuration for automated deployment

- Configure SSH deployment to /root/develop/dota2-match-calendar
- Use git pull --rebase --autostash for deployment
- Add Discord notifications for build status

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.drone.yml

@@ -0,0 +1,33 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: deploy
+    image: appleboy/drone-ssh
+    settings:
+      host:
+        - 206.237.26.184
+      username: root
+      key:
+        from_secret: ssh_key
+      passphrase:
+        from_secret: ssh_passphrase
+      port: 33740
+      command_timeout: 2m
+      script:
+        - echo "Deploying dota2-match-calendar"
+        - cd /root/develop/dota2-match-calendar
+        - echo "Pulling latest changes"
+        - git pull --rebase --autostash
+        - echo "Deployment completed"
+
+  - name: discord notification
+    image: appleboy/drone-discord
+    settings:
+      webhook_id:
+        from_secret: discord_webhook_id
+      webhook_token:
+        from_secret: discord_webhook_token
+    when:
+      status: [success, failure]