S3: add support for STS temporary credentials

Fixes #1558

Co-authored-by: Nazarii Mediukh <nazar.medykh@gmail.com>
Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/vfs/s3fs.go

@@ -114,7 +114,11 @@ func NewS3Fs(connectionID, localTempDir, mountPath string, s3Config S3FsConfig)
 			return fs, err
 		}
 		awsConfig.Credentials = aws.NewCredentialsCache(
-			credentials.NewStaticCredentialsProvider(fs.config.AccessKey, fs.config.AccessSecret.GetPayload(), ""))
+			credentials.NewStaticCredentialsProvider(
+				fs.config.AccessKey,
+				fs.config.AccessSecret.GetPayload(),
+				fs.config.SessionToken),
+		)
 	}
 
 	fs.setConfigDefaults()