chore: add support for rumdl

[remyleone]

DELETE THIS TEMPLATE BEFORE SUBMITTING

In order to have a good experience with our community, we recommend that you
read the contributing guidelines for making a PR, and understand the lifecycle
of a Packer Plugin PR:

https://github.com/scaleway/packer-plugin-scaleway/blob/main/.github/CONTRIBUTING.md#opening-an-pull-request

Describe the change you are making here!

Please include tests. We recommend looking at existing tests as an example.

If your PR resolves any open issue(s), please indicate them like this so they will be closed when your PR is merged:

Closes #xxx
Closes #xxx

[Copilot]

Pull request overview

This PR introduces Markdown linting via rumdl and aligns existing documentation files with the linter’s expectations, while also consolidating/adjusting CI checks to ensure generated docs are committed.

Changes:

• Add rumdl configuration (.rumdl.toml) and a new rumdl job in the lint workflow.
• Reformat multiple Markdown/MDX docs (code fences, headings, spacing) to satisfy lint rules and keep generated web docs in sync.
• Move the “docs compiled / generated output is committed” check into the existing unit-tests workflow and remove the dedicated workflow.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Minor Markdown formatting changes (spacing/code fences).
example/README.md	Adjust shell command example formatting.
docs/README.md	Adjust code fence language and list formatting.
docs/builders/scaleway.mdx	Normalize headings and code example sections.
.web-docs/README.md	Keep compiled web docs aligned with source docs formatting.
.web-docs/components/builder/scaleway/README.md	Keep compiled builder docs aligned with updated formatting.
.rumdl.toml	New rumdl rule configuration.
.github/workflows/unit-tests.yml	Add “generated files are committed” check after make generate.
.github/workflows/lint.yml	Rename workflow + add rumdl job.
.github/workflows/ensure-docs-compiled.yaml	Remove standalone docs compilation check workflow.
.github/DEBUG.md	Adjust code fence language to shell.

Comments suppressed due to low confidence (2)

.github/workflows/lint.yml:24

• The rumdl job checks out the repository using an unpinned actions/checkout ref, which is inconsistent with the rest of the workflows that pin actions to a specific commit SHA. Pinning avoids unexpected CI changes when the upstream tag moves.
  .github/workflows/lint.yml:27
• The rumdl GitHub Action is configured to run twice (rvben/rumdl@v0 is used in two consecutive steps). This duplicates CI work and can produce redundant output; keep a single step to run the linter once.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 7.54%. Comparing base (db52e54) to head (9a9d7c1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #333   +/-   ##
=====================================
  Coverage   7.54%   7.54%           
=====================================
  Files         38      38           
  Lines       1604    1604           
=====================================
  Hits         121     121           
  Misses      1459    1459           
  Partials      24      24           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.