feat(cli): install tht as a system command

scripts/build-tht.sh

@@ -5,6 +5,36 @@ export DOCKER_BUILDKIT=1
 repository_root=$(cd "$(dirname "$0")/.." && pwd)
 output_directory="${THT_THT_OUTPUT_DIRECTORY:-$repository_root/dist/tht}"
 
+usage() {
+  cat <<'EOF'
+Usage: bash scripts/build-tht.sh [--all] [--output ABSOLUTE_DIRECTORY]
+
+Build every supported native tht binary with the repository-pinned Docker builder.
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --all)
+      ;;
+    --output)
+      [[ $# -ge 2 ]] || { echo "--output requires an absolute directory" >&2; exit 2; }
+      output_directory=$2
+      shift
+      ;;
+    --help|-h)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "unknown argument: $1" >&2
+      usage >&2
+      exit 2
+      ;;
+  esac
+  shift
+done
+
 if [[ "$output_directory" != /* || "$output_directory" == / || "$output_directory" == */ ||
       "$output_directory" == *//* || "/$output_directory/" == */../* ||
       "/$output_directory/" == */./* ]]; then