Add cross-compilation dockerfile

.dockerignore

@@ -1,2 +1 @@
-/conf
 /target

Dockerfile

@@ -1,11 +1,20 @@
-FROM docker.io/python:3.11-slim-bookworm
+FROM ubuntu:noble
 
-RUN apt update && apt install -y cargo libudev-dev pkg-config
+COPY conf/sources.list /etc/apt/sources.list
+RUN apt update
+RUN dpkg --add-architecture armhf
 
-ENV VIRTUAL_ENV=/opt/venv
-RUN python3 -m venv $VIRTUAL_ENV
-ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+RUN apt install -y gcc-arm-linux-gnueabihf rustup build-essential
+RUN apt install -y pkg-config python3 python3-pip python3-venv protobuf-compiler
+RUN apt install -y libudev-dev:armhf
+
+RUN rustup default stable && rustup target add armv7-unknown-linux-gnueabihf
 
 WORKDIR /app
 COPY . .
-RUN pip install maturin && maturin develop
+
+ENV PKG_CONFIG_ALLOW_CROSS=1
+ENV PKG_CONFIG_PATH=/usr/lib/arm-linux-gnueabihf/pkgconfig
+ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc
+ENV PYO3_CROSS_PYTHON_VERSION=3.12
+RUN cargo build --release --target armv7-unknown-linux-gnueabihf