Make TRUSTED_DOMAINS parsing consistent with EXTENSIONS pattern (#2)

Make TRUSTED_DOMAINS parsing consistent with EXTENSIONS parsing

Author: Copilot

registry/coder/modules/code-server/run.sh

@@ -17,7 +17,8 @@ fi
 TRUSTED_DOMAINS_ARG=""
 if [ -n "${TRUSTED_DOMAINS}" ]; then
   # Split comma-separated domains and create multiple --link-protection-trusted-domains arguments
-  for domain in $(echo "${TRUSTED_DOMAINS}" | tr ',' ' '); do
+  IFS=',' read -r -a DOMAIN_ARRAY <<< "${TRUSTED_DOMAINS}"
+  for domain in "$${DOMAIN_ARRAY[@]}"; do
     if [ -n "$domain" ]; then
       TRUSTED_DOMAINS_ARG="$TRUSTED_DOMAINS_ARG --link-protection-trusted-domains=$domain"
     fi