add missing confirm for apt ruby install

src/lib.js

@@ -7,7 +7,7 @@ export function prepareFpmArgs() {
 }
 
 export async function installFpmViaRuby(debug) {
-  const aptCmd = 'sudo apt-get install ruby';
+  const aptCmd = 'sudo apt-get install -y ruby';
   const gemCmd = 'sudo gem install fpm';
   if (debug) {
     console.log('ruby install command: ', rubyCmd);