Multiline environment variable doesn't parsed to K8S_SECRET correctly

Summary

Using the auto-devops K8S_SECRET_ feature to create secrets,
I have noticed that this env var processing doesn't work with multiline.

I have tried using a pem formatted key and to generate a secret out of it,
but instead it created the value only from the first line (-----BEGIN CERTIFICATE------)

Steps to reproduce

Make use of auto-devops and create a multi line environment variable

Example Project

https://gitlab.com/natvaldev/env-var-bug

What is the current bug behavior?

The secret is created with only the first line of the variable value.

What is the expected correct behavior?

Gitlab should load the value of the variable with the line breaks.

Relevant logs and/or screenshots

https://gitlab.com/natvaldev/env-var-bug/-/jobs/370574277

Output of checks

This bug happens on GitLab.com