Adds a new reusable CI component for installing mise (development tool
version manager) in GitLab CI/CD pipelines.

This component provides a `.mise_install` partial base that:
- Installs mise binary with SHA256 checksum verification
- Supports multi-platform (Linux/macOS, x64/arm64)
- Auto-detects and installs dependencies (curl, ca-certificates)
- Supports multiple package managers (apt-get, apk, yum, dnf)
- Uses GL_MISE_VERSION with fallback to GL_COMMON_RENOVATE_MISE_VERSION
- Activates mise with bash shims for easy tool access

Includes comprehensive documentation with usage examples, platform
support matrix, and troubleshooting guide.

Testing:
- Adds CI tests for ubuntu:latest, debian:latest, alpine:latest
- Validates YAML syntax and installation on multiple base images
- Tests run on MR when relevant files change

- Remove duplicate include of .gitlab-ci-other-versions.yml in test file
- Change default MISE_INSTALL_PATH back to $HOME/.local/bin (was /usr/local/bin)
- /usr/local/bin requires sudo permissions in most images

CI jobs typically run as root, so /usr/local/bin is the appropriate
default installation path. Users can override with MISE_INSTALL_PATH
variable if needed.

Alpine Linux doesn't have /usr/local/bin in PATH by default.
Use /usr/bin instead which is standard across all distributions.

Alpine uses musl libc instead of glibc. Detect the libc type and:
- For musl (Alpine): download pre-compiled mise binary directly
- For glibc (Debian/Ubuntu/etc): download and extract tarball as before

This fixes the installation on Alpine Linux while maintaining
compatibility with other distributions.

Changed to use tarball for musl instead of direct binary download.
Musl tarballs use normalized arch names (arm64, x64) like:
- mise-v2026.2.19-linux-arm64-musl.tar.gz
- mise-v2026.2.19-linux-x64-musl.tar.gz

This is consistent with glibc tarballs and simplifies the installation
logic to use a single code path for all platforms.

Use more reliable musl detection by checking for musl library files:
- Check for /lib/ld-musl-*.so.1
- Check for /usr/lib/ld-musl-*.so.1
- Fall back to ldd --version check

This is more reliable than only checking ldd output, which may not
be available or may format output differently on Alpine.

Add AGENTS.md with comprehensive guidance for AI agents working on the project, covering component creation workflow, naming conventions, git workflow, and documentation standards. Add CLAUDE.md as a reference pointer.

Co-authored-by: Pierre Guinoiseau <pguinoiseau@gitlab.com>

docs: add AI agent guidance documentation

See merge request !1312

Rename the extensible task from .mise_install to .setup_mise to better
reflect its purpose - it sets up the mise binary but doesn't run 'mise install'.

- Renamed .mise_install to .setup_mise in all YAML files
- Renamed mise-installer.yml to setup-mise.yml
- Renamed mise-installer.md to setup-mise.md
- Renamed templates/mise-installer to templates/setup-mise
- Updated all documentation and file references

feat: add mise-installer CI component

See merge request !1311

## [3.7.0](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2026-02-24)

### Features

* add mise-installer CI component ([8543d915](8543d915))

### Fixes

* correct mise-installer test configuration and default path ([51d21777](51d21777))
* improve musl detection for Alpine Linux ([4308decf](4308decf))
* support Alpine Linux by detecting musl and using correct binary ([e81cd6e2](e81cd6e2))
* use /usr/bin as default MISE_INSTALL_PATH ([e5b606ea](e5b606ea))
* use /usr/local/bin as default MISE_INSTALL_PATH ([2025eca2](2025eca2))
* use tarball for musl with correct architecture naming ([f2983a78](f2983a78))

### Docs

* add AI agent guidance documentation ([7de2c710](7de2c710))

### Others

* rename .mise_install task to .setup_mise ([443180ff](443180ff))

The prepare-release.sh script was only updating component references
ending in '-build', missing standalone components like helm-unittest,
docker, setup-mise, etc. Removed the '-build' suffix requirement to
match all component names.

fix: update all component version references in prepare-release script

See merge request !1314

chore(deps): update pre-commit hook gitlab-com/gl-infra/common-ci-tasks to v3.7

See merge request !1313

## [3.7.1](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2026-02-25)

### Fixes

* update all component version references in prepare-release script ([e038c4ca](e038c4ca))

### Dependencies

* **deps:** update pre-commit hook gitlab-com/gl-infra/common-ci-tasks to v3.7 ([760bd113](760bd113))