Support voice-aware configuration and version-skew builds (#39953)

## What changed

- Add `chat.toggle_voice_mute` to the configurable TUI keymap and generated configuration schema.
- Let the exec-server version-skew harness build the voice-enabled CLI on Debian-like Linux hosts without preinstalled development metadata by assembling a temporary package sysroot.
- Preserve the existing build path on other Linux environments when the Debian package tools are unavailable.

## Testing

- Add a shell test that verifies a non-Debian Linux environment without voice metadata still proceeds to the Cargo build.

GitOrigin-RevId: 95c5ebc3f85d152a5217dee561286f2be662f79a

codex-rs/exec-server/testing/run_version_skew.sh

@@ -29,6 +29,40 @@ case "$(uname -s):$(uname -m)" in
 esac
 
 asset="codex-${target}.tar.gz"
+
+if [[ "$(uname -s)" == "Linux" ]] \
+  && command -v apt-get >/dev/null \
+  && command -v dpkg-deb >/dev/null \
+  && command -v dpkg-architecture >/dev/null \
+  && ! pkg-config --exists alsa glib-2.0 gobject-2.0 gio-2.0; then
+  # Debian-like hosts can download development metadata without sudo. The
+  # temporary sysroot still relies on runtime libraries installed on the host.
+  voice_package_directory="${release_directory}/voice-packages"
+  voice_sysroot="${release_directory}/voice-sysroot"
+  mkdir -p "${voice_package_directory}" "${voice_sysroot}"
+  (
+    cd "${voice_package_directory}"
+    apt-get download libasound2-dev libglib2.0-dev libcap-dev libffi-dev libmount-dev \
+      libpcre2-dev libselinux1-dev zlib1g-dev libblkid-dev libsepol-dev
+  )
+  for package in "${voice_package_directory}"/*.deb; do
+    dpkg-deb --extract "${package}" "${voice_sysroot}"
+  done
+
+  voice_multiarch="$(dpkg-architecture -qDEB_HOST_MULTIARCH)"
+  voice_library_directory="${voice_sysroot}/usr/lib/${voice_multiarch}"
+  for library in "${voice_library_directory}"/*.so; do
+    [[ -L "${library}" ]] || continue
+    library_target="$(readlink "${library}")"
+    if [[ ! -e "${voice_library_directory}/${library_target}" && -e "/usr/lib/${voice_multiarch}/${library_target}" ]]; then
+      ln -s "/usr/lib/${voice_multiarch}/${library_target}" "${voice_library_directory}/${library_target}"
+    fi
+  done
+
+  export PKG_CONFIG_PATH="${voice_library_directory}/pkgconfig${PKG_CONFIG_PATH:+:${PKG_CONFIG_PATH}}"
+  export PKG_CONFIG_SYSROOT_DIR="${voice_sysroot}"
+fi
+
 cd "${repo_root}/codex-rs"
 cargo build -p codex-cli --bin codex
 export CODEX_TEST_CURRENT_CODEX="${CARGO_TARGET_DIR:-${repo_root}/codex-rs/target}/debug/codex"

codex-rs/exec-server/testing/run_version_skew_test.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+script_directory="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+script_path="${script_directory}/run_version_skew.sh"
+fake_bin="$(mktemp -d "${TMPDIR:-/tmp}/codex-version-skew-test.XXXXXX")"
+trap 'rm -rf "${fake_bin:?}"' EXIT
+
+for tool in bash dirname mkdir mktemp rm sed; do
+  ln -s "$(command -v "${tool}")" "${fake_bin}/${tool}"
+done
+
+printf '%s\n' \
+  '#!/usr/bin/env bash' \
+  'case "${1:-}" in' \
+  '  -s) printf "Linux\\n" ;;' \
+  '  -m) printf "x86_64\\n" ;;' \
+  '  *) exit 1 ;;' \
+  'esac' >"${fake_bin}/uname"
+chmod +x "${fake_bin}/uname"
+
+printf '%s\n' \
+  '#!/usr/bin/env bash' \
+  'exit 1' >"${fake_bin}/pkg-config"
+chmod +x "${fake_bin}/pkg-config"
+
+printf '%s\n' \
+  '#!/usr/bin/env bash' \
+  'printf "reached cargo\\n" >&2' \
+  'exit 97' >"${fake_bin}/cargo"
+chmod +x "${fake_bin}/cargo"
+
+set +e
+output="$(PATH="${fake_bin}" "${script_path}" latest 2>&1)"
+status=$?
+set -e
+
+if [[ "${status}" -ne 97 || "${output}" != *"reached cargo"* ]]; then
+  printf '%s\n' "expected non-Debian Linux without voice metadata to reach cargo" >&2
+  printf 'status: %s\n%s\n' "${status}" "${output}" >&2
+  exit 1
+fi