Installing bash for alpine dockerfiles

[KasuniHemasika]

Purpose

Fix for the issue #72

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[chirangaalwis]

@KasuniHemasika Don't we have to update the OB AM profile as well?

Also, please accept the license/CLA prior to merging.

[KasuniHemasika]

@KasuniHemasika Don't we have to update the OB AM profile as well?

For OB-AM bash has already been installed.

Also, please accept the license/CLA prior to merging.

I have signed the CLA. And when I check, get the message "You have signed the CLA for wso2/docker-open-banking". @chirangaalwis Can you please check?