chore: add Apache License 2.0 and ignore build directory

scripts/distrobox/build.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck source=scripts/distrobox/common.sh
+source "$script_dir/common.sh"
+
+for argument in "$@"; do
+  if [[ "$argument" == "-o" || "$argument" == -o=* ]]; then
+    die "build output is managed by this script; do not pass -o"
+  fi
+done
+
+prepare_distrobox
+mkdir -p -- "$repo_root/build"
+
+# shellcheck disable=SC2016 # This script is evaluated inside the container.
+build_script='set -Eeuo pipefail
+repo_root=$1
+shift
+cd -- "$repo_root"
+go build "$@" -o build/captioneer ./src/cmd/captioneer
+go build "$@" -tags gtk -o build/captioneer-desktop ./src/cmd/captioneer-desktop'
+
+distrobox enter --no-workdir --name "$container_name" -- \
+  bash -lc "$build_script" captioneer-build "$repo_root" "$@"
+
+printf 'Built terminal binary: %s\n' "$repo_root/build/captioneer"
+printf 'Built desktop binary: %s\n' "$repo_root/build/captioneer-desktop"
+printf 'The desktop binary requires compatible GTK4 and gtk4-layer-shell runtime libraries.\n'