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alnoki
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Jun 12, 2026
## Problem
The `Tests` CI job (`.github/workflows/test.yml`) spends ~6.5 min of its
~11 min on essentially every PR's first run installing Solana and
**building anchor-cli from source**, before `make test` starts.
## Root cause
A workflow run can only restore caches created on **its own ref** or on
the repo's **default branch (`main`)** — never on a different PR's ref.
`test.yml` triggered **only** `on: pull_request`, so the job never ran
on a push to `main` and the `main` cache scope — the only scope every PR
can read — was never populated. Every PR's caches lived on
`refs/pull/<N>/merge`, invisible to other PRs, so each new PR missed and
rebuilt the toolchain.
Secondary: the cargo cache key embedded `hashFiles('Cargo.lock')` with
no `restore-keys` fallback, so any `Cargo.lock` change cold-compiled all
deps.
## Fix
1. **Run the job on push to `main`** so a post-merge run saves both the
toolchain cache (`install-toolchain`, key
`toolchain-solana-<ver>-anchor-<rev>-<platform>`) and the cargo cache
into the `main` scope that every subsequent PR inherits — eliminating
the repeated ~6.5 min Anchor builds.
2. **Add `restore-keys` to the cargo cache** so a dep bump restores the
nearest prior cache and compiles incrementally instead of cold.
No new cache step or change to `install-toolchain/action.yml` needed —
its key is already stable/version-pinned; it just needed the `main`
scope populated, which fix #1 provides.
## Verification
After this merges to `main` and a `main` run completes:
1. On a throwaway PR, confirm the `install-toolchain` step logs a
**cache hit** for `toolchain-solana-...` (no `install-tools.sh` run) and
the cargo step hits or restores via `restore-keys`.
2. `gh cache list --json key,ref` shows entries with `ref:
refs/heads/main`.
3. Total Tests wall-clock drops by roughly the ~6.5 min toolchain build.
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Changes
lintandsemantic-prchecks on pull requests.pre-commitconfiguration withyamllint,markdownlint,mdformat,cspell,checkmake, and standard hygiene hooks, plus their per-tool configs undercfg/.Makefilewithlinttarget (and requiredall/clean/testphony targets) to run pre-commit locally against the same config used in CI.init-prandpr-title-descriptionClaude skills for PR workflow automation.