added test moon details to the TESTING.md doc

.docs/TESTING.md

@@ -5,3 +5,26 @@
 The hosting website (hosting.holium.com) involves Stripe payments and is thus tested E2E with Cypress.
 
 The Realm client itself is changed at a fast pace, so automated testing is not worth the cost at the time of writing.
+
+## Test Distribution Moon
+
+Moon: `~nimwyd-ramwyl-dozzod-hostyv`
+
+`~nimwyd-ramwyl-dozzod-hostyv` runs on a Digital Ocean droplet:
+
+Digital Ocean Team: `Holium - Moons only`
+Projects: `Realm`
+Droplet: `app-host-staging`
+
+For access to the Digital Ocean team and project, please contact cody@holium.com.
+
+### Test Moon App Deployment Steps
+
+Staging builds deploy Urbit agent changes to the staging app host: `~nimwyd-ramwyl-dozzod-hostyv`:
+
+1. The following files on the `%realm` desk are updated:
+
+- desk.docket-0 - the version string is updated to reflect the version of the current build
+- desk.ship - contents of this file are changed to `~nimwyd-ramwyl-dozzod-hostyv`
+
+2. The `%usher` desk's `%marshal` agent is poked during deployments to `|commit` changes to the realm hoon sources to this moon