Docker Secrets: Use Encoding Parameter Directly

Signed-off-by: Jonas Thelemann <e-mail@jonas-thelemann.de>

lib/config/dockerSecret.js

@@ -7,7 +7,7 @@ const basePath = path.resolve('/var/run/secrets/')
 
 function getSecret (secret) {
   const filePath = path.join(basePath, secret)
-  if (fs.existsSync(filePath)) return fs.readFileSync(filePath).toString('utf8')
+  if (fs.existsSync(filePath)) return fs.readFileSync(filePath, 'utf-8')
   return undefined
 }