docs(self-host): add in prebuilt docker image

Author: barelyhuman

readme.md

@@ -49,12 +49,23 @@ deployments than I liked.
 
 I wouldn't want that to happen again, so I really recommend people to spin up
 their own instances if they can afford to do so. If not, you can always use the
-hosted version from me at [goblin.barelyhuman.xyz](https://goblin.run)
+hosted version from me at [goblin.run](https://goblin.run)
 
 **Note:the original code for gobinaries is equally simple to use and deploy but
 you'll have to make a few tweaks to the original code to make it work in a
 simpler fashion**
 
+
+### Existing Image 
+The repository builds a nightly image that you can use directly if you don't wish to tweak anything. 
+
+```sh
+$ docker run -p "3000:3000" ghcr.io/barelyhuman/goblin:nightly
+# change the domain to whatever you are using for it
+$ docker run -e "GOBLIN_ORIGIN_URL=example.com" -p "3000:3000" ghcr.io/barelyhuman/goblin:nightly
+```
+
+### From Source
 Let's start
 
 1. Clone the code