Increase network timeout for yarn in Dockerfile to prevent timeout errors on cross builds.

Dockerfile

@@ -95,7 +95,7 @@ RUN a2enmod rewrite
 # Install composer and yarn dependencies for Part-DB
 USER www-data
 RUN composer install -a --no-dev && composer clear-cache
-RUN yarn install && yarn build && yarn cache clean && rm -rf node_modules/
+RUN yarn install --network-timeout 600000 && yarn build && yarn cache clean && rm -rf node_modules/
 
 # Use docker env to output logs to stdout
 ENV APP_ENV=docker

src/Form/Type/StructuralEntityType.php

@@ -119,7 +119,7 @@ class StructuralEntityType extends AbstractType
                     //Must be the same as the separator in the choice_loader, otherwise this will not work!
                     return $element->getFullPath('->');
                 }
-                
+
                 return $element->getID();
             }, //Use the element id as option value and for comparing items
             'choice_loader' => function (Options $options) {