Allow integration with Secret Manager and maybe SSM store too for env variables

[praneetloke]

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Tell us about your request

Allow environment variables to be referenced from an SSM parameter store path. Specifically for secret env vars I realize I could use secure string type parameters in SSM but there might be situations where I only want to use a secret stored in Secret Manager and thus would like to reference a secret by its ARN like other services (ECS etc.) allow in their configuration.

Describe alternatives you've considered

I'd have to integrate the AWS SDK in my app to fetch the parameters/secrets myself rather than injecting them as env vars. I'd prefer not to do that so that my app isn't concerned with fetching env vars.

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[praneetloke]

Of course I now realize there is already #48, #19 and #6. I'll close this.