fix(openshift): make post-render script compatible with mac

[leiicamundi]

Which problem does the PR fix?

This PR aims to address compatibility issues with the post-render script on macOS. Currently, the script does not function properly on macOS and does not return an error. To resolve this, we introduce the usage of gsed (GNU sed) on macOS.

Additionally, I propose an alternative approach to eliminate the need for the post-render script altogether by using a flag in the source control configuration (scc) to remove the attribute. This would simplify the process for end users as demonstrated in the example provided here.

What's in this PR?

This PR introduces compatibility for the post-render script on macOS by utilizing gsed (GNU sed). This ensures that the script functions correctly across both macOS and Linux environments.

Checklist

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Before opening the PR:

• Run make go.update-golden-only in the repo's root dir.
• Ensure there is no other open pull request for the same update/change.
• Add tests for charts if needed.
• Update in-repo documentation if necessary.

After opening the PR:

• Sign our CLA (Contributor License Agreement) (will show once you open the PR).
• Ensure all checks/tests pass in the PR.

[hamza-m-masood]

@leiicamundi this will only work on macs that have an apple silicon chip. Could you think of a solution that also includes the macs with intel chips?

[leiicamundi]

Hello @hamza-m-masood, are you sure? https://github.com/bevry/dorothy/blob/master/commands/is-mac seems to use the same trick
I don't have a intel mac on hands, what is the output of uname on intel mac?

[drodriguez-305]

@leiicamundi I have a personal Mac with a i9. Used the uname command and it's the same Darwin.