The upstream oven-sh/setup-bun action saves with a deterministic key
(Bun version) that isn't ref-aware. On every second-and-subsequent run
against the same PR ref, the GitHub cache API rejects the duplicate
key+ref with a 409 (HTML body), and @actions/cache treats the unparsable
response as transient and burns ~20-30s on 5 retries before warning.
The 35 MB Bun binary downloads in 2-3s, so disabling the cache is a net
wallclock win and removes the noisy warning that fires on every PR push
after the first.
Closes#1252
Co-authored-by: Mukunda Rao Katta <mukunda.vjcs6@gmail.com>
