Added info about kojitest

docs/onboarding/index.md

@@ -65,6 +65,24 @@ Ask any already existing koji admin to run:
 koji grant-permission admin $USERNAME
 ```
 
+You will probably also want access to the kojitest instance:
+
+```
+koji -p kojitest add-user $USERNAME --principal=$USERNAME@CERN.CH
+for i in build admin; do koji -p kojitest grant-permission $i $USERNAME; done
+```
+
+Here's the config for kojitest:
+```
+[kojitest]
+server = https://kojitesthub.cern.ch/kojihub
+weburl = https://kojitest.cern.ch/
+topurl = https://kojitest.cern.ch/kojifiles
+krb_canon_host = no
+krb_rdns = false
+no_ssl_verify = true
+```
+
 ### Add user to the `linux:adm` AFS group
 
 Get a Kerberos ticket with the `linux@CERN.CH` principal