fix(circleci): fix whitespace in shell script (#2222)

.circleci/publish_cloudflare_pages.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
-GIT_ROOT=$( git rev-parse --show-toplevel )
+GIT_ROOT="$(git rev-parse --show-toplevel)"
 
 CLOUDFLARE_PAGES_PROJECT_NAME="${CLOUDFLARE_PAGES_PROJECT_NAME:-"viewer"}"
 VIEWER_SANDBOX_DIR_PATH="${VIEWER_SANDBOX_DIR_PATH:-"packages/viewer-sandbox"}"