We were previously setting the phabricator variabels we needs within builds to be environment variables however there are issues arount pulling out ENVS when on the agent within `buildStarted` step. To resolve the lack of environment variable access we are going to use sharedParameters which also doesn't work with variables prefixed with `env.` hence the rename.
To make sure there are no naming conflicts with teamcity environment variable we are renaming the vars injected to the build via the harbormaster trigger.