set environment variables on ami(to fill ec2 plugin cred's) runnig jenkins master in docker to start slaves with ec2 plugin

[Pruthvi Raj Reddy Chukkannagari]

I'm trying to run slaves using ec2. plugin. I'm running my master in docker over AWS ami. I can auto fill the ec2 plugin configurations for instances with docker env file where as I do not want to show my aws keys in evs' file rather try get an alternative using environment variables configured over the machine.