ci: back mbx with the GitHub Actions cache alone

[jdx]

Retires the remote cache server from CI: every job now uses mbx's GitHub Actions cache backend. Removes the backend-selection expression, the mbx-backend workflow plumbing, the fork-PR cache mirror, and the server-warming workflow — all of which existed to route trusted builds at cache.mise.jdx.dev. mbx itself stays.

id-token: write grants are left in place where they may serve Pages deploys or attestations; they can be tightened separately.

🤖 Generated with Claude Code

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Note

Low Risk
Workflow-only change to build caching; no app logic, though trusted CI may see slower or colder caches without the remote server.

Overview
CI now routes all mbx setup through the GitHub Actions cache backend, dropping the trusted/untrusted split that pointed maintainer builds at cache.mise.jdx.dev.

The composite .github/actions/mbx action is simplified: backend and mirror-github-cache inputs, the fork-PR cache mirror step, and server-url / OIDC settings are removed; backend: github is fixed on mr-boxington-action.

ci-impl.yml no longer accepts or forwards mbx-backend, and jobs call mbx without mirror flags. ci.yml stops passing mbx-backend: server vs github into the trusted and untrusted workflow paths.

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Summary by CodeRabbit

• Refactor
  • Standardized build caching on the GitHub Actions cache backend.
  • Removed configurable cache backend and cache mirroring options.
  • Simplified continuous integration workflows by eliminating backend configuration inputs.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: d1109a06-daf0-4ff7-94b4-cfb4a9e6aa6a

📥 Commits

Reviewing files that changed from the base of the PR and between 37bde07 and fb965fd.

📒 Files selected for processing (3)

• .github/actions/mbx/action.yml
• .github/workflows/ci-impl.yml
• .github/workflows/ci.yml

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📝 Walkthrough

Walkthrough

The mbx composite action now always uses the GitHub Actions cache backend. CI workflow inputs and job invocations no longer select a backend or configure GitHub cache mirroring.

Changes

mbx Cache Consolidation

Layer / File(s)	Summary
Standardize the mbx action .github/actions/mbx/action.yml	The action uses backend: github with jdx/mr-boxington-action version 0.6.0. It removes server configuration, backend selection, and cache mirroring.
Update CI workflow wiring .github/workflows/ci-impl.yml, .github/workflows/ci.yml	The reusable workflow removes mbx-backend. Trusted and untrusted jobs no longer pass backend values. Local mbx invocations no longer pass backend or mirroring settings.

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

A rabbit checks the cache with care
GitHub’s backend waits in there
Old server flags hop away
CI runs a simpler way
Clean workflows greet the day

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[greptile-apps]

Greptile Summary

The PR retires the remote mbx cache server and standardizes CI on the GitHub Actions cache backend.

• Hardcodes the composite mbx action to use the GitHub backend.
• Removes backend-selection and cache-mirroring inputs.
• Simplifies the reusable CI workflow and both trusted and untrusted callers.

Confidence Score: 5/5

The PR appears safe to merge, with the removed workflow inputs consistently eliminated from all in-repository callers.

The trusted and untrusted CI paths now invoke the same GitHub cache backend, and no stale input references, incompatible workflow callers, or concrete cache initialization failures remain.

Important Files Changed

Filename	Overview
.github/actions/mbx/action.yml	Replaces conditional server/GitHub backend selection and explicit mirroring with one pinned action invocation using the GitHub backend.
.github/workflows/ci-impl.yml	Removes the reusable backend input and obsolete arguments from all three mbx setup steps without leaving stale references.
.github/workflows/ci.yml	Removes backend arguments from both reusable-workflow callers while preserving their trust and permission boundaries.

_{Reviews (1): Last reviewed commit: "ci: back mbx with the GitHub Actions cac..." | Re-trigger Greptile}