move references to sub-folders into workflow files

[wxtim]

Rationalize where constants are kept. Came out of reviewing #5140

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Tests not required because there has been not functional change