Add Node Host env variable

Add Node Host env variable (defaults to 0.0.0.0 address)

Author: ZainabSalameh

NodeBase/Dockerfile.txt

@@ -91,6 +91,8 @@ ENV DISPLAY :99.0
 ENV NODE_MAX_INSTANCES 1
 # As integer, maps to "maxSession"
 ENV NODE_MAX_SESSION 1
+# As address, maps to "host"
+ENV NODE_HOST 0.0.0.0
 # As integer, maps to "port"
 ENV NODE_PORT 5555
 # In milliseconds, maps to "registerCycle"