Add CI config

.drone.yml

@@ -0,0 +1,25 @@
+---
+# don't forget to sign with:
+# drone sign CMS/public_slides --save
+kind: pipeline
+type: ssh
+name: deploy website
+
+server:
+  host: c3d2-web.flpk.zentralwerk.org
+  user: c3d2-web
+  ssh_key:
+    from_secret: ssh_key
+
+clone:
+  depth: 1
+
+steps:
+  - name: copy website
+    commands:
+      - rsync --links --verbose --recursive --delete --delete-after --delete-excluded --checksum --chmod=ugo=rX,u+w --exclude=".git/" . /var/www/cms-slides/
+---
+kind: signature
+hmac: 5ef7e5f9bf61d8889f15e8c1cf15a0b7592fc3950f1d13a1dde92bbfdcf7fa6f
+
+...