Add DB host for passwords test.

docs/services/passwords.md

@@ -55,6 +55,7 @@ The Password app is currently deployed to the following environments:
 |             |                                      | password-node2.csi.private.cam.ac.uk (secondary) |
 |             |                                      | password-nodeq.csi.private.cam.ac.uk (quorum)    |
 | Test        | https://password-test.csx.cam.ac.uk/ | password-test.csx.cam.ac.uk                      |
+|             |                                      | devgroup-test-db.srv.uis.private.cam.ac.uk       |
 
 > password-test.csx has its own fake local password clients that act as black
 > holes for all password changes. Any actions that require a password to be