ug: custom-ci: Switch to usage of the new compose publish utility

[mike-sul]

Replace references to compose-publish utility with references to composectl publish utility since we moved all App related functionality into the single component composectl and will be doing further development only in the scope of composeapp project.

PR Template and Checklist

Please complete as much as possible to speed up the reviewing process.

Readiness and adding reviewers as appropriate is required.

All PRs should be reviewed by a technical writer/documentation team and a peer.
If effecting customers—which is a majority of content changes—a member of Customer Success must also review.

Readiness

• Merge (pending reviews)
• Merge after date or event
• Draft

Overview

Why merge this PR? What does it solve?

Checklist

• Run spelling and grammar check, preferably with linter.
• Avoid changing any header associated with a link/reference.
• Step through instructions (or ask someone to do so).
• Review for wordiness
• Match tone and style of page/section.
• Run make linkcheck.
• View HTML in a browser to check rendering.
• Use semantic newlines.
• follow best practices for commits.
  • Descriptive title written in the imperative.
  • Include brief overview of QA steps taken.
  • Mention any related issues numbers.
  • End message with sign off/DCO line (-s, --signoff).
  • Sign commit with your gpg key (-S, --gpg-sign).
  • Squash commits if needed.
• Request PR review by a technical writer and at least one peer.

Comments

Any thing else that a maintainer/reviewer should know.
This could include potential issues, rational for approach, etc.

[doanac]

Docs for ea6805f are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2788/docs/artifacts/html/index.html

[mike-sul]

@vanmaegima @caiotpereira Updating the doc on the custom Ci for Apps so it references the composectl publish instead of compose-publish. The gihub workflow example was updated too.

[mike-sul]

@kprosise FYI, this update is not bound to LmP version/release hence can be merged into main and published at any time.

[mike-sul]

@kprosise It looks like the test/vale failure is not related to this PR change.

[kprosise]

LGTM!