Env var type "File" works exactly as "Variable"

Summary

"File" env var doesn't actually create a file, but instead contains the secret data within it. Leads to unpleasant consequences re printing stuff in the console.

Steps to reproduce

• https://github.com/Jtalk/digito/blob/63560c4a95b53dab1fa1ba5273074a70bc10e4b1/.gitlab-ci.yml See variables.WITH_SSH and $DEPLOY_SSH_KEY within it.
• Create DEPLOY_SSH_KEY with your key like this:
• Run your pipeline and watch your not-so-private-anymore key being printed:
• Spend Sunday morning revoking & replacing the not-so-private-anymore key everywhere.

Example Project

https://gitlab.com/jtalk-group/digito/-/jobs/325943225

What is the current bug behavior?

File variables don't work as documented.

What is the expected correct behavior?

File variables work as documented.

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's tough to read otherwise.)

Output of checks

gitlab.com

Results of GitLab environment info

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Results of GitLab application Check

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Possible fixes

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