Environment variable to configure node port(s)

[TimothyLoyer]

Is your feature request related to a problem? Please describe.
I need to run singlestoredb-dev-image in a Kubernetes Pod alongside other infrastructure (including MySQL) to run tests. I am attempting to upgrade from my customized CIAB image, in which I had overridden the startup script so that PORT could be set in the environment. This would cause the master node to use the specified port, and the leaf node to use PORT + 1.

I attempted a similar customization for the singlestoredb-dev-image. However, it appears that due to the execution of init.sh within the original image, I am unable to simply modify the file within my image to alter the ports.

Here is the script I use to populate the port argument in sdb-admin create-node and sdb-admin add-leaf:

MASTER_PORT="${PORT:-3306}"
LEAF_PORT="$((MASTER_PORT + 1))"

Describe the solution you'd like
Add an environment variable to allow node port(s) to be customized and resolve port conflicts.

Describe alternatives you've considered
Writing my own Dockerfile, or figuring out an additional script to run to update the configurations or recreate the nodes (this is pretty unfavorable).