Ceredentials configuration

Using `pass` command for key

Edit .aws/credentials:

[default]
region = eu-west-2
credential_process = /usr/bin/pass <account>

The contents of the password file needs to be in JSON format like:

{
  "Version": 1,
  "AccessKeyId": "AKIA...",
  "SecretAccessKey": "...",
}

aws sts get-caller-identity