Initial (wip) staging deployment

This adds an initial configuration for staging. Note that we are doing
this ahead of having the full infrastructure in all 3 DCs. So this
this will result in some cross-DC writes for now (e.g. we have a single cache in
IAD). We'll correct this as the infrastructure becomes available.

We'll also run jobs on every app server, until we split them out to
separate instances.

bin/docker-entrypoint

@@ -2,7 +2,7 @@
 
 # If running the rails server then create or migrate existing database
 if [ "${1}" == "./bin/thrust" ] && [ "${2}" == "./bin/rails" ] && [ "${3}" == "server" ]; then
-  ./bin/rails db:prepare
+  MIGRATE=1 ./bin/rails db:prepare
 fi
 
 exec "${@}"