Added option for multiple secrets

[BrutalBirdie]

very simple very short.

See: https://github.com/blindsidenetworks/scalelite#environment-variables

[jfederico]

Thanks for the PR @BrutalBirdie, it looks good. Just a couple of comments.

1- It is outdated now, if you don't mind and still would like me to merge it, you would have to rebase it. I would have done it but you locked me out to edit your branch.
2- I was also going to add the env variables to the dotenv file. I agree to include them, but the dotenv is kindda the only documentation this script has, so, better to include them in the same way scalelite does.

I can take the code and make the changes myself, but I rather have you credited for the contribution.

Thanks again

[BrutalBirdie]

Will take a look tomorrow