diff --git a/public/sites/default/all.settings.php b/public/sites/default/all.settings.php
index 05daef53..a25f2955 100644
--- a/public/sites/default/all.settings.php
+++ b/public/sites/default/all.settings.php
@@ -9,12 +9,6 @@
   'sql_mode' => 'SET sql_mode="STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_ENGINE_SUBSTITUTION"',
 ];
 
-if ($drush_options_uri = getenv('DRUSH_OPTIONS_URI')) {
-  if (str_contains($drush_options_uri, 'www.hel.fi')) {
-    $config['helfi_proxy.settings']['default_proxy_domain'] = 'www.hel.fi';
-  }
-}
-
 // Elasticsearch settings.
 if (getenv('ELASTICSEARCH_URL')) {
   $config['elasticsearch_connector.cluster.kasko']['url'] = getenv('ELASTICSEARCH_URL');
@@ -32,3 +26,31 @@
 
 // Sentry DSN for React.
 $config['react_search.settings']['sentry_dsn_react'] = getenv('SENTRY_DSN_REACT');
+
+$additionalEnvVars = [
+  'AZURE_BLOB_STORAGE_SAS_TOKEN|BLOBSTORAGE_SAS_TOKEN',
+  'AZURE_BLOB_STORAGE_NAME',
+  'AZURE_BLOB_STORAGE_CONTAINER',
+  'DRUPAL_VARNISH_HOST',
+  'DRUPAL_VARNISH_PORT',
+  'PROJECT_NAME',
+  'DRUPAL_API_ACCOUNTS',
+  'DRUPAL_VAULT_ACCOUNTS',
+  'REDIS_HOST',
+  'REDIS_PORT',
+  'REDIS_PASSWORD',
+  'TUNNISTAMO_CLIENT_ID',
+  'TUNNISTAMO_CLIENT_SECRET',
+  'TUNNISTAMO_ENVIRONMENT_URL',
+  'SENTRY_DSN',
+  'SENTRY_ENVIRONMENT',
+  // Project specific variables.
+  'ELASTIC_PROXY_URL',
+  'ELASTICSEARCH_URL',
+  'ELASTIC_USER',
+  'ELASTIC_PASSWORD',
+  'SENTRY_DSN_REACT',
+];
+foreach ($additionalEnvVars as $var) {
+  $preflight_checks['environmentVariables'][] = $var;
+}