feat: pass LLVM_MINGW_UBUNTU_REL to install script

Author: x1unix

Dockerfile

@@ -2,6 +2,7 @@ ARG GO_VERSION=1.24
 FROM golang:${GO_VERSION}-trixie AS builder
 ARG GO_VERSION
 ARG LLVM_MINGW64_VER=20241030
+ARG LLVM_MINGW_UBUNTU_REL='22.04'
 ARG LLVM_MINGW64_SRC="https://github.com/mstorsjo/llvm-mingw/releases/download"
 ENV LLVM_MINGW64_VER="${LLVM_MINGW64_VER}"
 ENV LLVM_MINGW64_SRC="$LLVM_MINGW64_SRC"