switch recommended binary cache to cache.forall.systems

[mrshmllow]

closes #504

Summary by CodeRabbit

• Changed
  • Updated binary cache settings to use a new cache endpoint and signing key.
  • Removed references to the previous cache provider across setup and configuration examples.
• Documentation
  • Revised installation, key setup, and tutorial guidance to reflect the new cache configuration.
  • Updated the changelog with the latest cache-related configuration change.

[coderabbitai]

Warning

Review limit reached

@mrshmllow, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 48 minutes and 23 seconds. Learn how PR review limits work.

Your organization has used up its prepaid credits, and credit purchases are no longer available. Enable the review add-on in the billing tab to keep reviews running — you're only billed for reviews past your plan's rate limits ($0.25/file).

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

To avoid repeated limits, reduce automatic review volume by pausing incremental auto-reviews earlier, using label-based review opt-in, excluding WIP or generated PR titles, or requesting reviews manually when the PR is ready. If your team needs uninterrupted high-volume reviews, an organization admin can enable usage-based credits.

🚦 How do rate limits work?

CodeRabbit enforces per-developer PR review limits for each organization. Most developers receive the normal plan review availability.

For paid Pro and Pro+ PR reviews, CodeRabbit uses adaptive limits for sustained high-volume activity. When a developer's recent PR review activity reaches the 95th percentile or higher among CodeRabbit users, additional reviews become available more gradually as earlier reviews age out of the rolling window.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d7346356-51e4-45c6-a4ad-706648d59b57

📥 Commits

Reviewing files that changed from the base of the PR and between fdbb7d7 and beefc3c.

📒 Files selected for processing (5)

• .github/actions/setup-nix/action.yml
• CHANGELOG.md
• doc/snippets/guides/example-action.yml
• doc/snippets/tutorial/cache.conf
• doc/snippets/tutorial/cache.nix

📝 Walkthrough

Walkthrough

Replaces the garnix binary cache (cache.garnix.io) with a custom cache (cache.forall.systems) across CI configuration, Nix snippets, documentation, and changelog. The garnix.yaml build configuration file is deleted entirely.

Changes

Garnix → cache.forall.systems migration

Layer / File(s)	Summary
Cache substituter and key updates .github/actions/setup-nix/action.yml, doc/snippets/guides/example-action.yml, doc/snippets/tutorial/cache.conf, doc/snippets/tutorial/cache.nix, garnix.yaml	Replaces cache.garnix.io substituter and its public key with cache.forall.systems in the setup-nix action and all Nix config snippets; removes garnix.yaml entirely.
Docs and changelog CHANGELOG.md, doc/guides/installation.md, doc/guides/keys.md, doc/tutorial/part-one/nix-setup.md	Updates installation and tutorial docs to remove garnix-specific wording; adds a breaking-change entry and the new cache URL to CHANGELOG.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• forallsys/wire#461: Directly edits the same Binary Cache documentation sections, changing garnix-related cache guidance and URLs.

Poem

🐇 Hop hop, garnix is gone today,
A new cache has come to stay!
forall.systems holds the keys,
No more garnix, if you please.
The rabbit signs the Nix with glee~ 🌸

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: replacing the recommended binary cache with cache.forall.systems.
Linked Issues check	✅ Passed	The PR addresses #504 by removing Garnix references and switching the recommended cache and keys to cache.forall.systems.
Out of Scope Changes check	✅ Passed	The changed files all support the Garnix shutdown/cache migration, with no clearly unrelated code changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch marshmallow/p-nytymrszolsv

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

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

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@doc/guides/keys.md`:
- Line 28: The trusted-key guidance in the keys guide is too vague because it
says “our binary cache” without naming the cache or pointing to the install
docs. Update the wording in the relevant paragraph in keys.md to explicitly
mention cache.forall.systems, or add a clear link to the Binary Cache
installation instructions, so readers can find the recovery step directly.

In `@doc/snippets/tutorial/cache.conf`:
- Around line 2-3: The cache snippet is overriding Nix defaults instead of
extending them, which removes the standard cache and key. Update the
configuration in cache.conf to use the extra-substituters and
extra-trusted-public-keys settings so cache.forall.systems is added alongside
the default cache.nixos.org entries, matching the behavior used in the other
docs and CI examples.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 87a4a06d-a300-4809-b7a1-639ee4dc8dae

📥 Commits

Reviewing files that changed from the base of the PR and between a2f9f25 and fdbb7d7.

📒 Files selected for processing (9)

• .github/actions/setup-nix/action.yml
• CHANGELOG.md
• doc/guides/installation.md
• doc/guides/keys.md
• doc/snippets/guides/example-action.yml
• doc/snippets/tutorial/cache.conf
• doc/snippets/tutorial/cache.nix
• doc/tutorial/part-one/nix-setup.md
• garnix.yaml

💤 Files with no reviewable changes (1)

• garnix.yaml