I am getting \"Enter passphrase for /dev/fd/63\" error when my \".gitlab-ci.yml\" tries to remote to my Ubuntu server for executing SSH com
Since openssh is package with Git for Windows, try and use an opeenssh key (generated with ssh-keygen), without (for now) a passphrase (to avoid needing an ssh-agent)
Register your openssh public key (default id_rsa.pub) on the AWS side.
As in, for instance, "Importing Your Own Public Key to Amazon EC2".