chore: add Apache License 2.0 and ignore build directory

scripts/distrobox/common.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
+# shellcheck disable=SC2034 # Exported to scripts that source this helper.
+repo_root="$(cd -- "$script_dir/../.." && pwd -P)"
+
+container_name="${CAPTIONEER_DISTROBOX_NAME:-captioneer-dev}"
+container_image="${CAPTIONEER_DISTROBOX_IMAGE:-registry.fedoraproject.org/fedora-toolbox:44}"
+
+container_packages=(
+  ShellCheck
+  bzip2
+  curl
+  gcc
+  golang
+  gtk4-devel
+  gtk4-layer-shell-devel
+  libX11-devel
+  libXfixes-devel
+  pkgconf-pkg-config
+  pulseaudio-utils
+  tar
+)
+
+die() {
+  printf 'captioneer: %s\n' "$*" >&2
+  exit 1
+}
+
+require_command() {
+  command -v "$1" >/dev/null 2>&1 || die "$1 was not found in PATH"
+}
+
+ensure_container() {
+  require_command distrobox
+  distrobox create \
+    --yes \
+    --no-entry \
+    --name "$container_name" \
+    --image "$container_image" >/dev/null
+}
+
+ensure_dependencies() {
+  local dependency_script
+  # shellcheck disable=SC2016 # This script is evaluated inside the container.
+  dependency_script='set -Eeuo pipefail
+missing=()
+for package in "$@"; do
+  if ! rpm -q "$package" >/dev/null 2>&1; then
+    missing+=("$package")
+  fi
+done
+if (( ${#missing[@]} > 0 )); then
+  printf "Installing missing Captioneer dependencies: %s\\n" "${missing[*]}"
+  sudo dnf install -y "${missing[@]}"
+fi'
+
+  distrobox enter --no-workdir --name "$container_name" -- \
+    bash -lc "$dependency_script" captioneer-dependencies "${container_packages[@]}"
+}
+
+prepare_distrobox() {
+  ensure_container
+  ensure_dependencies
+}
+
+if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
+  die "common.sh is a shared helper; run build.sh or run.sh instead"
+fi