ci: the DCO app checks merge-queue commits, so remove the placeholder DCO workflow

[wmadden-electric]

At a glance

The merge-queue commits for #30392, #30397 and #30410 each carry two DCO results:

DCO  dco             success   <- the DCO app; the ruleset requires this one
DCO  github-actions  success   <- .github/workflows/dco.yml; ignored

After this PR only the app's result remains.

What this PR changes

1. Deletes .github/workflows/dco.yml.
2. docs/oss/ci-pipeline.md says the DCO check comes from the DCO app, on PRs and on merge-queue commits.

Why the placeholder existed, and why it can go

The DCO requires a Signed-off-by: trailer on every commit. The DCO GitHub App enforces it by posting a check named DCO. Until recently the app only ran on PRs, so a merge-queue commit never got a DCO result and the queue stalled. dco.yml filled that gap: it ran on merge_group, echoed a message, and passed without reading any commits.

The app now handles merge-queue events: the org installation accepted its new "Merge queues" permission. The main ruleset requires DCO from the app only, so the placeholder's result no longer counts toward the merge. It only costs a runner for every queued PR.

Tests

None; this is a workflow deletion. This PR's own trip through the merge queue shows the app's DCO result satisfying the requirement without the placeholder.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that the DCO app posts a separate check for pull requests and merge-queue commits.
• Chores
  • Removed a redundant DCO workflow check; DCO sign-off checks continue to be posted by the DCO app.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

Configuration used: Repository: prisma/orm/.coderabbit.yml

Review profile: CHILL

Plan: Advanced

Run ID: 40a97295-81cb-4f37-ad3f-256cbf336758

📥 Commits

Reviewing files that changed from the base of the PR and between 4f0a334 and f1d21b6.

📒 Files selected for processing (2)

• .github/workflows/dco.yml
• docs/oss/ci-pipeline.md

 ____________________________________
< Squash the bug, not the messenger. >
 ------------------------------------
  \
   \   \
        \ /\
        ( )
      .( o ).

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

---

_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

size-limit report 📦

Path	Size
postgres / no-emit	195.1 KB (0%)
postgres / emit	165.75 KB (0%)
mongo / no-emit	185.11 KB (0%)
mongo / emit	166.58 KB (0%)
cf-worker / no-emit	218.07 KB (0%)
cf-worker / emit	185.51 KB (0%)

[pkg-pr-new]

Open in StackBlitz

@prisma/orm-extension-arktype-json

npm i https://pkg.pr.new/@prisma/orm-extension-arktype-json@30419

@prisma/orm-extension-middleware-cache

npm i https://pkg.pr.new/@prisma/orm-extension-middleware-cache@30419

@prisma/orm-extension-paradedb

npm i https://pkg.pr.new/@prisma/orm-extension-paradedb@30419

@prisma/orm-extension-pgvector

npm i https://pkg.pr.new/@prisma/orm-extension-pgvector@30419

@prisma/orm-extension-postgis

npm i https://pkg.pr.new/@prisma/orm-extension-postgis@30419

@prisma/orm-extension-supabase

npm i https://pkg.pr.new/@prisma/orm-extension-supabase@30419

@prisma/orm-family-mongo

npm i https://pkg.pr.new/@prisma/orm-family-mongo@30419

@prisma/orm-family-sql

npm i https://pkg.pr.new/@prisma/orm-family-sql@30419

@prisma/orm-framework

npm i https://pkg.pr.new/@prisma/orm-framework@30419

@prisma/orm-mongo

npm i https://pkg.pr.new/@prisma/orm-mongo@30419

@prisma/orm-postgres

npm i https://pkg.pr.new/@prisma/orm-postgres@30419

@prisma/orm-sqlite

npm i https://pkg.pr.new/@prisma/orm-sqlite@30419

@prisma/orm-target-mongo

npm i https://pkg.pr.new/@prisma/orm-target-mongo@30419

@prisma/orm-target-postgres

npm i https://pkg.pr.new/@prisma/orm-target-postgres@30419

@prisma/orm-target-sqlite

npm i https://pkg.pr.new/@prisma/orm-target-sqlite@30419

@prisma/orm-toolchain

npm i https://pkg.pr.new/@prisma/orm-toolchain@30419

commit: f1d21b6