## Motivation
`cran-rpkgs-test` was added as a second pull zone on the same B2 origin, but it was never added to `BUNNY_PULLZONES`. It therefore keeps serving pre-reindex indexes behind the same ~370 day `cache_expiration_time` as production, and nothing ever refreshes it.
That is not cosmetic. The zone exists to be measured, and a verification run against it measures whatever the edge still holds:
```
production: regressions=0 AGHmatrix Path=NA Built=R 4.5.3; x86_64-pc
staging : regressions=161 AGHmatrix Path=4.5 Built=(none)
```
Same objects, same origin, 161 phantom regressions. I chased that number through two wrong diagnoses before noticing production and staging disagreed.
## Change
Add `cran-rpkgs-test.b-cdn.net` to the purge list in both reindex pipelines.
## Note
A `Cache-Control: no-cache` request header is not a substitute. It was added to the verification script and did **not** clear this: bunny does not honour it for these objects. Purging is the mechanism that works.
Reviewed-on: #181
pat-s
a2923bf063