Which part is the COOKIE

root@3287454ea40e98:/app# cat releases/COOKIE
NLJUCOSN4EAOYXBAXMAIHATUPVFYGNC7CXFK25BWYRKUMJCXM2VA====root@3287454ea40e98:/app#

Looks like there is no \n at the end of the file. The contents are NLJUCOSN4EAOYXBAXMAIHATUPVFYGNC7CXFK25BWYRKUMJCXM2VA====

You can double check by running

cat releases/COOKIE; echo

instead.

Thanks