[#181] Support AWS credentials profiles

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

README.md

@@ -107,11 +107,12 @@ const s3_cli = s3.connect("https://s3.frostfs.devenv:8080")
 You can also provide additional options:
 ```js
 import s3 from 'k6/x/frostfs/s3';
-const s3_cli = s3.connect("https://s3.frostfs.devenv:8080", {'no_verify_ssl': 'true', 'timeout': '60s'})
+const s3_cli = s3.connect("https://s3.frostfs.devenv:8080", {'no_verify_ssl': 'true', 'timeout': '60s', 'aws_profile': 'metal'})
 ```
 
 * `no_verify_ss` - Bool. If `true` - skip verifying the s3 certificate chain and host name (useful if s3 uses self-signed certificates)
 * `timeout` - Duration. Set timeout for requests (in http client). If omitted or zero - timeout is infinite.
+* `aws_profile` - String. Use custom profile credentials from `$HOME/.aws/credentials` file. If omitted or empty - use default profile.
 
 ### Methods
 - `createBucket(bucket, params)`. Returns dictionary with `success` boolean flag

internal/s3/s3.go

@@ -59,7 +59,9 @@ func (s *S3) Connect(endpoint string, params map[string]string) (*Client, error)
 		}, nil
 	})
 
-	cfg, err := config.LoadDefaultConfig(s.vu.Context(), config.WithEndpointResolverWithOptions(resolver))
+	cfg, err := config.LoadDefaultConfig(s.vu.Context(),
+		config.WithEndpointResolverWithOptions(resolver),
+		config.WithSharedConfigProfile(params["aws_profile"]))
 	if err != nil {
 		return nil, fmt.Errorf("configuration error: %w", err)
 	}