Fix content linters

Marcia Ramosrequested to merge
fix-content-linter-other-repos into master

Fix content linters for Omnibus, Runner, and Charts.

We need a .tool-versions file present in the dir to run markdownlint.

This script:

  • Curls .tool-versions file from GitLab Docs's master.
  • Creates a .tool-versions file with a custom name .docs-tool-versions (to avoid conflicting with repos' .tool-versions file that can be implemented in the future).
  • asdf install the repo.
  • Runs markdownlint.
  • Deletes .docs-tool-versions.

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