Add ENVIRONMENT environment variable

Feels like this should have been the first one we did.

Author: steventux

scripts/bash/deploy_arc_ring.sh

@@ -81,6 +81,7 @@ AZURE_RELAY_HYBRID_CONNECTION=hc-${MACHINE}
 CLOUD_API_ENDPOINT=${CLOUD_API_ENDPOINT}
 CLOUD_API_RESOURCE=${CLOUD_API_RESOURCE}
 APPLICATIONINSIGHTS_CONNECTION_STRING=${APPLICATIONINSIGHTS_CONNECTION_STRING}
+ENVIRONMENT=${ENVIRONMENT}
 MWL_AET=RUBIE_MWL_${API_ENVIRONMENT}
 MWL_PORT=104
 MWL_DB_PATH=${BASE_PATH}/data/worklist.db