NO-JIRA: chore(check-params-env GHA): fix the variable parsing

[jstourac]

This is a followup for the #1134.

Description

How Has This Been Tested?

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• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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[jstourac]

/override ci/prow/images

[openshift-ci]

@jstourac: Overrode contexts on behalf of jstourac: ci/prow/images

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/override ci/prow/images

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[jiridanek]

/lgtm