Add corepack to base image
What does this MR do and why?
Add corepack to base image.
Also:
- Remove OS-installed yarn from HTML linting image.
- Add comments about Yarn v1 to Markdown linting image.
CC @aqualls @sarahgerman just FYI
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.
Edited by Evan Read