Add tmux feature

[Copilot]

Adds a tmux devcontainer feature. Since tmux only ships source tarballs on GitHub releases (no pre-built binaries), the install script builds from source using the repo's standard create-feature-skill patterns.

Changes

• src/tmux/devcontainer-feature.json — Feature metadata; version option defaults to latest, accepts tmux's X.Y[a] format (e.g. 3.5a, 3.4)
• src/tmux/install.sh — Builds tmux from the GitHub release source tarball following the standard create-feature-skill boilerplate:
  • Uses check_curl_file_tar_installed (standard name) with file, curl, tar, and ca-certificates checks
  • Installs build deps: build-essential, pkg-config, libevent-dev, libncurses-dev, bison
  • Adapts github_list_releases / utils_check_version regex to ^[0-9]+\.[0-9]+[a-z]?$ for tmux's X.Y[a] versioning scheme
  • Resolves latest/pinned release tag via GitHub API, downloads source tarball, builds with ./configure --prefix=/usr/local + make install
• src/tmux/NOTES.md — Notes file with project link, description, and installation method
• src/tmux/README.md — Auto-generated README combining feature metadata and NOTES.md content
• test/tmux/test.sh — Asserts tmux -V | grep 'tmux'
• .github/workflows/test.yaml — Updated to match main branch: replaced hardcoded feature matrix lists with dynamic changed-feature detection (new get-changed-features job)
• README.md — Added tmux entry to the root features table (synced with main)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add tmux feature</issue_title>
<issue_description>Files:

src/tmux/devcontainer-feature.json
src/tmux/install.sh (make sure to set executable bit)
test/tmux/test.sh
.github/workflows/test.yaml

Releases:

https://github.com/tmux/tmux/releases</issue_description>

<agent_instructions>install from github releases with known patterns for install.sh</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Add tmux feature #105

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[sebst]

tests fail

[Copilot]

tests fail

Fixed in b8f9144. The test-autogenerated job was failing with bash: autogen.sh: No such file or directory because tmux release tarballs include a pre-generated configure script and don't ship autogen.sh. Removed the autogen.sh step along with the now-unneeded autoconf/automake/bison build deps — the install now just runs ./configure --prefix=/usr/local && make install directly.

[sebst]

tests still failing

[Copilot]

tests still failing

Fixed in bf86955. The new failure was configure: error: "yacc not found" — tmux's ./configure requires yacc, which is provided by bison. The previous fix incorrectly removed bison along with autoconf/automake. Added bison back to the build deps.

[sebst]

Rework feature based on create feature skill

[Copilot]

Rework feature based on create feature skill

Done in 2cf4f10. Reworked install.sh to match the standard create-feature-skill pattern:

• Renamed check_curl_tar_installed → check_curl_file_tar_installed (standard name matching atuin.sh, btop, etc.)
• Added file command check and explicit apt_get_update call before installing missing packages
• All other boilerplate functions (version checking, GitHub release helpers, etc.) match the standard skill template with only the minimum adaptations for tmux's X.Y[a] versioning

[sebst]

Notes.md missing
Workflow file not up to date with main
Missing readme entry

Please obey the skill

[Copilot]

Notes.md missing
Workflow file not up to date with main
Missing readme entry...

Done in 2cde966:

• Added src/tmux/NOTES.md with project link, description, and installation method
• Added src/tmux/README.md (auto-generated format combining feature metadata + NOTES.md)
• Updated .github/workflows/test.yaml to match main's dynamic changed-feature detection (replacing the hardcoded feature list)
• Updated root README.md to match main's full features table, with the tmux entry added between tailscale.com and webinstall.dev