Implement ccutil as a make rule

[ekohl]

This removes a lot of logic from the GitHub Action and reuses infrastructure we already have in place. It also allows running in parallel.

It does give up the checks for images and images/common, but those are rather uncommon given how uncommon it is to introduce new guides.

• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (planned Satellite 6.15)
• Foreman 3.8/Katello 4.10
• Foreman 3.7/Katello 4.9 (Satellite 6.14)
• Foreman 3.6/Katello 4.8
• Foreman 3.5/Katello 4.7 (Satellite 6.13; orcharhino 6.6/6.7)
• Foreman 3.4/Katello 4.6 (EL8 only)
• Foreman 3.3/Katello 4.5 on EL7 & EL8 (Satellite 6.12 on EL8 only; orcharhino 6.4/6.5 on EL8 only)
• We do not accept PRs for Foreman older than 3.3.

[github-actions]

The PR preview for 31678a0 is available at theforeman-foreman-documentation-preview-pr-2876.surge.sh

The following output files are affected by this PR:

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[maximiliankolb]

Looks reasonable to me! I cannot commit much on ccutil though.

[ekohl]

I'll admit I didn't look at ccutil myself either. @adamlazik1 could you take a look?

[adamlazik1]

Personally, I'd probably not remove the image checks. Even though images are rarely changed, I can see this potentially causing us headache in the future.

[maximiliankolb]

Why do we run ccutils in the first place? What would we lose if we drop this?

[ekohl]

Why do we run ccutils in the first place? What would we lose if we drop this?

It's a tool that's used in Red Hat downstream to build, so it verifies that.