Add stress-ng benchmark job in workflow

[nikimanoledaki]

Implements cncf-tags/green-reviews-tooling#121

• Adds a benchmark workflow containing the list of job(s) such as the stress-ng benchmark job

[poiana]

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[poiana]

Welcome @nikimanoledaki! It looks like this is your first PR to falcosecurity/cncf-green-review-testing 🎉

[leogr]

Hey @nikimanoledaki

I see this PR is still in draft. Do you need anything from us to help with this?

Thanks

[nikimanoledaki]

HI @leogr, no need, thank you - blocked by cncf-tags/green-reviews-tooling#121 (comment) - will likely re-write this GHA workflow into a bash script! 👍