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For now the issue has been resolved by removing backports.zoneinfo from requirement.txt. App seems to work fine after removing this library :)
Not an intelligent solution, but it works and take me to the next roadblock
I was facing the same error while creating my container. I solved the error by using the exact version of my Python venv i.e. 3.8.9
Earlier for the image, I was using 3.8-alpine for a lighter version of the image. But, it wasn’t working out for me and got the same error as yours.
Hope this helps! Thanks.