Add TDLib packaging and release scripts

scripts/package-tdlib.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
+  echo "usage: $0 <tdlib-root> [output-tar.gz]" >&2
+  exit 1
+fi
+
+tdlib_root="$(realpath "$1")"
+output_path="${2:-tdlib-linux-x86_64.tar.gz}"
+output_path="$(realpath -m "$output_path")"
+
+include_dir="$tdlib_root/include"
+lib_dir="$tdlib_root/lib"
+
+if [ ! -f "$include_dir/td/telegram/td_json_client.h" ]; then
+  echo "missing TDLib header: $include_dir/td/telegram/td_json_client.h" >&2
+  exit 1
+fi
+
+if [ ! -f "$include_dir/td/telegram/tdjson_export.h" ]; then
+  echo "missing TDLib export header: $include_dir/td/telegram/tdjson_export.h" >&2
+  exit 1
+fi
+
+if ! compgen -G "$lib_dir/libtdjson.so*" >/dev/null; then
+  echo "missing TDLib shared library under: $lib_dir" >&2
+  exit 1
+fi
+
+workdir="$(mktemp -d)"
+trap 'rm -rf "$workdir"' EXIT
+
+mkdir -p "$workdir/tdlib"
+cp -a "$include_dir" "$workdir/tdlib/include"
+cp -a "$lib_dir" "$workdir/tdlib/lib"
+
+tar -C "$workdir" -czf "$output_path" tdlib
+sha256sum "$output_path" > "${output_path}.sha256"
+
+echo "wrote $output_path"
+echo "wrote ${output_path}.sha256"