[Improvement] Allow multiple devpages for multiple PRs

[Prid13]

Problem:

• Someone would like to test 2 different PRs on the live devpages website
• Currently, only 1 PR can be deployed at a time
• If a new PR is assigned the devpages label, or something is pushed to another PR with the devpages label, the previously-deployed PR gets wiped from the dev website as the new one gets auto-deployed, whether it's intended or not

Solution:

• Somehow, multiple PRs should be deployable simulatenously and be preview-able from different links
• Issues:
  • How to manage which PR to keep and which one to delete? Should there be an "admin" website for this? A separate PR just for this where commands are issued? Or be kept to e.g. last 2 PRs?
  • How to deploy multiple PRs to different folders?
  • How to detect last PRs with the devpages label?

[jonny-wg2]

Mhmm unsure what the best way to solve this is..

One idea is we leverage multiple labels devpages1, devpages2, devpages3 and then we duplicate our existing setup with 3 pipelines, 3 URLs etc. This a little more infrastructure vs. building a custom frontend that does toggling etc.