Add path style method option to s3 backend

[mcanevet]

Hello,

We have an s3-like service powered by minio. When I configure the remote store using the s3 backend, it tries to use S3's Virtual-Hosted Style Method and, as we do not have a wildcard pointing to our s3 service, it does not work.
S3 also support Path Style method, it would be great to have an option in Terrfaform's S3 backend so that we can configure it like that :

terraform {
  backend "s3" {
    bucket   = "my_bucket"
    key      = "foo/terraform.tfstate"
    endpoint = "https://s3.example.com"
    profile  = "my_profile"
    region   = "us-east-1"
    use_path_request_style = true
  }
}

so that it generates a request https://s3.example.com/my_bucket/foo/terraform.tfstate instead of https://my_bucket.s3.example.com/foo/terraform.tfstate.

Thanks

[stffabi]

The option force_path_style has been added with fb6b349

[mcanevet]

Thanks

[ghost]

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