fix: resolve symlinks before locating compose project

Use readlink -f to resolve the script's real path so that reload.sh
can be invoked through a symlink from any directory.

nginx/reload.sh

@@ -2,6 +2,7 @@
 
 set -euo pipefail
 
-cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+source="$(readlink -f -- "${BASH_SOURCE[0]}")"
+cd -- "$(dirname -- "$source")"
 
 exec docker compose exec -T nginx sh -s <./.reload-in-container.sh