Support for configuring http backend using environment variables

[jbloxsome]

Current Terraform Version

Terraform v0.12.3

Your version of Terraform is out of date! The latest version
is 0.12.6. You can update by downloading from www.terraform.io/downloads.html

Use-cases

Currently, when using an http remote backend, users must configure access details in code i.e

terraform {
  backend "http" {
    address = "http://myrest.api.com/foo"
    lock_address = "http://myrest.api.com/foo"
    unlock_address = "http://myrest.api.com/foo"
    username = "user"
    password = "secret"
  }
}

Support for environment variable configuration would allow users to remove sensitive information
such as passwords from the HCL code.

Proposal

Add support for configuring access to an http remote backend using environment variables e.g.

HTTP_BACKEND_URL
HTTP_BACKEND_USERNAME
HTTP_BACKEND_PASSWORD

[nicholasklick]

@pkolyvas This can be closed I assume since it was resolved by #25439

[pkolyvas]

Thanks @nicholasklick !

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.