fix: update Dockerfile to use Ubuntu base image and install necessary dependencies for multi-target builds

Author: linventif

Dockerfile

@@ -1,23 +1,34 @@
 # --- Étape 1 : build avec rust:1.88 + nightly via rust-toolchain.toml ---
-FROM rust:1.88 AS builder
+FROM ubuntu:18.04 AS builder
 
-# Prérequis systèmes pour Linux32/64 et Windows32/64
-RUN dpkg --add-architecture i386 \
- && apt-get update \
+# Set timezone to avoid interactive prompts
+ENV DEBIAN_FRONTEND=noninteractive
+ENV TZ=UTC
+
+# Install Rust and dependencies
+RUN apt-get update \
  && apt-get install -y --no-install-recommends \
     build-essential \
+    curl \
+    ca-certificates \
     gcc-multilib g++-multilib \
     gcc-mingw-w64-i686 g++-mingw-w64-i686 \
     gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 \
     liblua5.1-0-dev \
-    curl git pkg-config musl-dev \
+    git pkg-config \
  && rm -rf /var/lib/apt/lists/*
 
+# Install Rust manually
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+ENV PATH="/root/.cargo/bin:${PATH}"
+
 WORKDIR /build
 COPY rust-toolchain.toml .
 COPY . .
 
-# Compilation du workspace pour chaque target
+# Add targets and build
+RUN rustup target add i686-unknown-linux-gnu x86_64-unknown-linux-gnu i686-pc-windows-gnu x86_64-pc-windows-gnu
+
 RUN echo "→ build Linux 32-bits" \
  && cargo build --release --target i686-unknown-linux-gnu \
  \