Resolve "Blog: Building build images for GitLab CI/CD"

Closes #5034 (closed)

Checklist for writer

• Link to issue added, and set to close when this MR is merged
• N/A Due date and milestone (if applicable) added for the desired publish date
• N/A If time sensitive
  • N/A Added ~"priority" label
  • N/A Mentioned @rebecca to give her a heads up ASAP
• Blog post file formatted correctly, including any accompanying images
• Review app checked for any formatting issues
• Reviewed by fellow team member
• Assign to @rebecca for review

/label ~"blog post"