Remove unused DGRAPH_ZERO_GRPC_PRIVATE_PORT environment variable
DGRAPH_ALPHA_GRPC_EXTERNAL_PUBLIC_PORT=9080
DGRAPH_ALPHA_HTTP_EXTERNAL_PUBLIC_PORT=8080
DGRAPH_RATEL_HTTP_EXTERNAL_PUBLIC_PORT=8000
-DGRAPH_ZERO_GRPC_PRIVATE_PORT=5080
# Localstack's edge port; all Localstack services are proxied through
# this port.
