v2026.6.8

A small fix release: `zig@master` now behaves as a true rolling channel, and `jdx/ruby` precompiled installs always pick up the latest numbered build revision.

## Fixed
- **ruby:** Precompiled installs from the default `jdx/ruby` source now require a numeric build-revision tag (e.g. `3.3.11-1`, `3.3.11-2`) and ignore the floating base release. Lockfiles already pin to a revision and the base tag is treated as revision `0`, so unlocked installs land on the newest rebuilt binary instead of an older one. Custom `ruby.precompiled_url` GitHub sources keep the previous base-tag fallback ([#10428](https://github.com/jdx/mise/pull/10428) by @jdx).
- **zig:** `zig@master` is now treated as a rolling release channel. mise resolves it to the concrete nightly it currently points at (e.g. `0.17.0-dev.836+e357134f0`) via `ziglang.org/download/index.json`, installs into a versioned directory rather than a frozen `installs/zig/master`, and reuses the latest installed nightly for the channel — never an unrelated stable release — when running offline or from hook-env. As a result, `mise upgrade zig` and `mise outdated` can finally track new nightlies ([#10423](https://github.com/jdx/mise/pull/10423) by @JamBalaya56562, addresses [#10251](https://github.com/jdx/mise/issues/10251)).

  ```sh
  mise use zig@master
  mise upgrade zig   # moves to the current nightly
  ```

## Documentation
- Vertically center the social-link icons in the docs site header ([#10424](https://github.com/jdx/mise/pull/10424) by @smasato).

## New Contributors
* @smasato made their first contribution in [#10424](https://github.com/jdx/mise/pull/10424)

**Full Changelog**: https://github.com/jdx/mise/compare/v2026.6.7...v2026.6.8

## 💚 Sponsor mise

mise is built by [@jdx](https://github.com/jdx) under [**en.dev**](https://en.dev) — an independent studio making developer tooling (mise, [aube](https://aube.en.dev/), and more). Development is funded by sponsors.

If mise saves you or your team time, please consider sponsoring at [en.dev](https://en.dev). Individual and company sponsorships keep mise fast, free, and independent.