doc: add Cloudron package (#4937)

Fixes #4936

docs/content/doc/installation/from-package.en-us.md

@@ -64,3 +64,16 @@ bundled templates, options, plugins and themes are in `/usr/local/share/gitea`,
 is in `/usr/local/etc/rc.d/gitea`.
 
 To enable Gitea to run as a service, run `sysrc gitea_enable=YES` and start it with `service gitea start`.
+
+## Cloudron
+
+Gitea is available as a 1-click install on [Cloudron](https://cloudron.io). For those unaware,
+Cloudron makes it easy to run apps like Gitea on your server and keep them up-to-date and secure.
+
+[![Install](https://cloudron.io/img/button.svg)](https://cloudron.io/button.html?app=io.gitea.cloudronapp)
+
+The Gitea package is maintained [here](https://git.cloudron.io/cloudron/gitea-app).
+
+There is a [demo instance](https://my-demo.cloudron.me) (username: cloudron password: cloudron) where
+you can experiment with running Gitea.
+