chore: replace npm command

Ensure a more repoducible build. package.json and package-lock.json need to be maintained

Author: nicodr97

front_end/Dockerfile

@@ -39,7 +39,7 @@ WORKDIR /var/www/html
 ADD openVRE /var/www/html/openVRE
 RUN cd openVRE
 WORKDIR /var/www/html/openVRE
-RUN npm install
+RUN npm ci
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 RUN composer self-update
 RUN composer update --ignore-platform-req=ext-mongodb --ignore-platform-req=ext-mongodb