initial codes try 2

files/entrypoint.sh

@@ -5,7 +5,7 @@ log(){ echo "[nats-registration][entrypoint] $*"; }
 err(){ echo "[nats-registration][entrypoint][ERROR] $*" >&2; }
 
 # Sanity: tools
-for bin in curl jq python3; do
++for bin in curl jq python; do
   command -v "$bin" >/dev/null 2>&1 || { err "Missing $bin"; exit 2; }
 done
 

files/nats-registration-listener.sh

@@ -57,4 +57,4 @@ if [[ -n "${PRINT_RAW:-}" ]]; then
   esac
 fi
 
-exec python3 /usr/local/bin/nats_registration_listener.py "${args[@]}"
+exec python /usr/local/bin/nats_registration_listener.py "${args[@]}"