Upgrade AWX to AWX 15 or higer version


I have a existing AWX set instllated in docker containers.

External RDS : PG Engine 12

Since its a big version change, I would like to test the upgrade to version 15 or 17 or higher using docker itself without impacting the current runnning aws app.

What would be the best way to test this upgrade process?

So far tested:
I tried to create a snapshot of the RDS and during the installation tried to pass the PG connection details of this copy RDS instance. But the installation failed.