Mark SRE build as BG-granted when a grant is completed

[Pabl0cks]

Complementary PR to BuidlGuidl/SpeedRunEthereum-v2#276

This PR adds:

• SRE API call when a grant is completed, to flag the SRE build as bg granted
• When a grant is marked as COMPLETED, we extract the buildId from the stored SRE link (…/builds/) and POST to SRE with { buildId, apiKey } to flag it as bgGrant.
• We need to setup SRE_API_KEY in both grants and SRE with the same value
• Centralized in the server-side review flow, so both single and batch reviews trigger the call consistently.
• Non-blocking: failures don’t prevent the grant from being completed.

How to test locally:

• Run both apps locally (grants + SRE). First grants, then SRE so they are setup in port 3000 and 3001 automatically
• In grants, set env:
  • SRE_API_URL=http://localhost:3001/builds/grant-completed
  • SRE_API_KEY=
• yarn seed and tweak one of the grants in local firestore to status= "submitted" and set the SRE link with the buildId you want to test, then do the final approval in admin
• The build in SRE database should change its bg_grant field to TRUE

Optional quick check (curl):

curl -i -X POST http://localhost:3001/api/builds/grant-completed \
  -H "Content-Type: application/json" \
  -d '{"buildId":"da3cce7f-07c7-4459-aafd-992cab7d4c8c","apiKey":"asd"}'

update parameters to your buildId and SRE_API_KEY value

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Project	Deployment	Preview	Comments	Updated (UTC)
grants-bg	✅ Ready	Preview	Comment	Aug 13, 2025 2:41pm

[carletex]

Thanks Pablo, I'll sleep better tonight haha

Approving, but letting the merge to you (in case you have to configure Vercel env vars or something before)