[31.x] Backport ci: inline runner selection #36671

1. 
   fanquake commented at 7:54 PM on October 26, 2026: member

   Backports

   • #35441
   • #35571
2. ci: inline runner selection

   We are currently sometimes backlogged on waiting for runner selection.
   
   Selecting Warp or GitHub-hosted runners directly from the repository context avoids serializing all CI jobs behind a metadata job. This keeps forks on public runners while allowing upstream jobs to schedule immediately on the intended runner labels.
   
   Github-Pull: #35441
   Rebased-From: 726e196ef26490115edc595973f6703e61e1295b

   90d20a4cf4
3. fanquake requested review from willcl-ark on Oct 26, 2026
4. DrahtBot added the label Backport on Oct 26, 2026
5. 
   DrahtBot commented at 7:54 PM on October 26, 2026: contributor

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   External sites

   • Code coverage & benchmarks: https://corecheck.dev/bitcoin/bitcoin/pulls/36671
   • Ralph review <img src=https://review.fish.foo/assets/bitcoin/bitcoin/36671.png alt="Ralph review status"> https://git.fish.foo/bitcoin/bitcoin/pulls/36671#author-ralph

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6. ci: use warp docker buildkit cache

   This was inadvertently broken in #35441
   
   Github-Pull: #35571
   Rebased-From: b552f1713add4d14c8b940a8175b6bbe19bea846

   8ce6136fb7
7. DrahtBot added the label CI failed on Oct 26, 2026
8. willcl-ark approved
9. 
   willcl-ark commented at 8:36 PM on October 26, 2026: member

   ACK 8ce6136fb704391727e270b3e3ca0ae784f43cf7

   Will prevent this 31.x branch getting hung up on a GHA determine-runners job.

   We'll restore (likely useless) caches, and never save them. But this is OK for this type of branch.

   Backports look clean.

10. DrahtBot removed the label CI failed on Oct 26, 2026
11. fanquake merged this on Oct 26, 2026
12. fanquake closed this on Oct 26, 2026

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13. fanquake deleted the branch on Oct 26, 2026
14. fanquake added this to the milestone 31.3 on Oct 27, 2026

Milestone
31.3