fix: support arm64 in install-lua-language-server

get_arch() only handled x86_64, so arm64 machines failed with
"unsupported architecture: arm64". Also switch the bin symlink to a
wrapper script: lua-language-server locates main.lua relative to its
own unresolved argv[0], so launching it through a symlinked executable
(rather than a symlinked directory) made it fail to find main.lua.

dot_local/bin/executable_install-lua-language-server

@@ -13,12 +13,23 @@ main() (
 
 	extract_tarball "${URL}" "${DEST}/${VERSION}"
 	set_current_link "${DEST}" "${VERSION}"
-	set_link "${XDG_BIN_HOME}/lua-language-server" "${DEST}" bin/lua-language-server
+
+	# lua-language-server locates main.lua next to its own argv[0], without
+	# resolving symlinks, so it can't be launched through a symlinked
+	# executable (only a symlinked directory in the path works). Use a
+	# wrapper script instead of set_link.
+	cat >"${XDG_BIN_HOME}/lua-language-server" <<EOF
+#!/usr/bin/env bash
+exec "${DEST}/current/bin/lua-language-server" "\$@"
+EOF
+	chmod +x "${XDG_BIN_HOME}/lua-language-server"
 )
 
 get_arch() (
 	case $(uname -m) in
 	x86_64*) echo x64 ;;
+	arm64*) echo arm64 ;;
+	aarch64*) echo arm64 ;;
 	*)
 		echo >&2 "unsupported architecture: $(uname -m)"
 		exit 1