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 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:
  • Installs build deps: build-essential, autoconf, automake, pkg-config, libevent-dev, libncurses-dev, bison
  • Adapts github_list_releases / utils_check_version regex from X.Y.Z to ^[0-9]+\.[0-9]+[a-z]?$ to match tmux's versioning scheme
  • Resolves latest/pinned release tag via GitHub API, downloads source tarball, builds with autogen.sh + ./configure --prefix=/usr/local + make install
• test/tmux/test.sh — Asserts tmux -V | grep 'tmux'
• .github/workflows/test.yaml — Adds tmux to both test-autogenerated and test-scenarios matrix lists

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/tmux/tmux/releases
  • Triggering command: /usr/bin/curl curl -s REDACTED conntrack --ctstate INVALID,NEW -j DROP (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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.