credential_process works differently than AWS cli

[yan12125]

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Expected Behavior

minio-go reads credential_process from ~/.aws/config, like what the official AWS cli does: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-sourcing-external.html

Current Behavior

minio-go reads credential_process from ~/.aws/credentials, not ~/.aws/config. See #1716.

Possible Solution

Read ~/.aws/config for credential_process

Steps to Reproduce (for bugs)

1. Configure credential_process following AWS docs
2. Try to use restic (a backup tool using minio-go) to access a backup repository on S3

Context

As mebtioned above, I'd like to use restic with credential_process

Regression

Not a regression

Your Environment

• Version used (minio --version): minio-go 7.0.46
  https://github.com/restic/restic/blob/v0.15.0/go.mod#L17
• Server setup and configuration: AWS S3
• Operating System and version (uname -a):

Linux archlinux 5.15.89-1-lts #1 SMP Wed, 18 Jan 2023 11:24:46 +0000 x86_64 GNU/Linux

[harshavardhana]

Feel free to send a fix, we should support both files.