docs: Document how to deploy to our live dokku instance

docs/admin/ods-dokku.md

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+# Push to the existing dokku app
+
+These instructions are for people with deploy access to Open Data Services's servers.
+
+These instructions are for deploying to the **live instance**.
+
+## Add your ssh key to dokku if you haven't already
+
+`scp` the key to the server, and then on the server:
+
+```
+dokku ssh-keys:add name_for_your_key_here path/to/your_key.pub 
+```
+
+## Set up your local git repo
+
+On your local machine, inside a clone of this repository:
+
+```
+# Add the dokku remote
+git remote add dokku-live dokku@dokku1.dokku.opendataservices.uk0.bigv.io:standards-lab-live
+```
+
+## Do a deploy
+
+On your local machine: 
+
+```
+git push dokku-live main
+```