Explore how to run napps builds in parallel

Currently only one executor node is available to run a build in napps-CI. 
This makes the overall build process slow, as every build needs to wait for a single executor. 
This would become more complicated in future when multiple connector developement process runs in parallel in the future. 
We need to find a way on how to  run parallel builds for different connectors. 
The outcome of this exploration should be the following.
1. How can we distribute different executors and auto-adjust on the fly based on builds queues. 
2. Does running builds in parallel interefere with each other by any means. ( particularly if there any common resource that might get used for the same in future)