Secret variables with a dollar sign are not correctly set

Summary

When a secret variable contains a dollar sign $, the secret variable is not set correctly. It seems the content after the dollar sign is expended as it was a variable.

I did not see documentation stating that this is the expected behavior.

Steps to reproduce

• Create a new repo
• Setup the repo with a new secret variable: `TEST=hello$world``
• Create a new .gitlab-ci.yml that contains

test:
  stage: test
    - env

• Push random code to run the CI step
• The content of the job will be TEST=hello

Example Project

None

What is the current bug behavior?

The content of the job will be TEST=hello

What is the expected correct behavior?

The content of the job sould be TEST=hello$world

Workaround

In the variable value, use a double dollar sign instead of a single: TEST=hello$$world instead of TEST=hello$world

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

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Results of GitLab application Check

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Possible fixes