Evaluate the possibility of providing environment variables support in secret-conf.properties to read the server home

[PrabhashDilhan]

Description:
If we enabled the secure vault in MI 1.2.0, we need to provide keystore path in secret-conf.properties as below.
/home/wso2carbon/wso2mi-1.2.0/repository/resources/security/wso2-keystore.jks

If we want to change the server home in containerized env, we need to change the above file every time.

Let's say we set the server home as environment variable as below.
WSO2_SERVER_HOME = /home/wso2carbon/wso2mi-{current-version}

It will be a good feature if we can read the keystore in secret-conf.properties as below.
{WSO2_SERVER_HOME}/repository/resources/security/wso2-keystore.jks

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Affected Product Version:
MI-1.2.0

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