Allow database encryption configuration to be possible with docker and k8s helm charts

The feature to configure encrypted database passwords has been addressed in part via CONFSERVER-60073 but docker and k8s functionality for configuration was not included as scope of this work.

More information on this feature can be found in the below docs :- 

• https://confluence.atlassian.com/display/CONFEAP/Encrypt+database+password
• https://confluence.atlassian.com/display/CONFEAP/Basic+encryption
• https://confluence.atlassian.com/display/CONFEAP/Advanced+encryption
• https://confluence.atlassian.com/display/CONFEAP/Custom+encryption