Use 'npm ci' instead of 'npm install' in scripts

[MAILPOET-1837]

RoboFile.php

@@ -8,7 +8,7 @@ class RoboFile extends \Robo\Tasks {
     return $this->taskExecStack()
       ->stopOnFail()
       ->exec('./composer.phar install')
-      ->exec('npm install')
+      ->exec('npm ci')
       ->run();
   }
 

build.sh

@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-# Translations (npm install & composer install need to be run before)
+# Translations (npm ci & composer install need to be run before)
 echo '[BUILD] Generating translations'
 ./do makepot
 ./do packtranslations
@@ -19,7 +19,7 @@ mkdir $plugin_name
 # Production assets.
 echo '[BUILD] Generating production CSS and JS assets'
 rm -rf node_modules
-npm install
+npm ci
 ./do compile:all --env production
 
 # Dependency injection container cache.