Use "uv" to compile wheels for more armv7l platforms

I use the buster image, so the wheels should be compatible with any newer distro as well

.github/workflows/build.yml

@@ -9,24 +9,22 @@ jobs:
     timeout-minutes: 15
     strategy:
       matrix:
-        docker_images: ['balenalib/armv7hf-debian:buster', 'balenalib/armv7hf-debian:bullseye', 'balenalib/armv7hf-debian:bookworm']
+        python-version: ['3.7', '3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
     - uses: actions/checkout@v4
     - name: Build ${{ matrix.docker_images }} wheel
       id: build
       run: |
-        docker build -f Dockerfile.armv7l -t lauszus/socketsocketcan --build-arg APP_IMAGE="${{ matrix.docker_images }}" .
+        docker build -f Dockerfile.armv7l -t lauszus/socketsocketcan --build-arg PYTHON_VERSION="${{ matrix.python-version }}" .
         docker cp "$(docker create lauszus/socketsocketcan)":/socketsocketcan-wheel .
+
+        # Copy over the wheel.
         mkdir dist
         cp socketsocketcan-wheel/socketsocketcan*.whl dist/
-
-        # Special characters are not allowed, so just use the Debian codename for the artifact name
-        name=$(echo -n "${{ matrix.docker_images }}" | cut -d ':' -f2)
-        echo "name=$name" >> "$GITHUB_OUTPUT"
     - name: Upload wheel as artifact
       uses: actions/upload-artifact@v4
       with:
-        name: socketsocketcan-armv7l-${{ steps.build.outputs.name }}-${{ github.sha }}
+        name: socketsocketcan-armv7l-${{ matrix.python-version }}-${{ github.sha }}
         path: dist
         retention-days: 1
         if-no-files-found: error

Dockerfile.armv7l

@@ -1,22 +1,39 @@
-ARG APP_IMAGE=balenalib/armv7hf-debian:stretch
+ARG APP_IMAGE=balenalib/armv7hf-debian:buster
 FROM $APP_IMAGE
 
+ARG PYTHON_VERSION=3.7
+
+ENV UV_PYTHON="$PYTHON_VERSION"
+ENV UV_SYSTEM_PYTHON=1
+
 COPY . /socketsocketcan
 
 RUN [ "cross-build-start" ]
 
+# Install uv.
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /bin/uv
+
 # Get dependencies.
 RUN apt-get -y update
 RUN apt-get -y install apt-utils
-RUN apt-get -y install build-essential python3-dev python3-pip
+RUN apt-get -y install build-essential clang python3-dev python3-pip
 RUN rm /usr/lib/python3.*/EXTERNALLY-MANAGED || true
-RUN python3 -m pip install --extra-index-url=https://www.piwheels.org/simple -U pip setuptools wheel pybind11
+
+# Install Python using uv if it is not the native one.
+RUN if ! uv python find "$PYTHON_VERSION" >/dev/null 2>&1; then \
+        uv python install "$PYTHON_VERSION" \
+    else \
+        python3 -m pip install --extra-index-url=https://www.piwheels.org/simple -U pip setuptools wheel \
+    fi
+
+# Install Python dependencies.
+RUN uv pip install --extra-index-url=https://www.piwheels.org/simple pybind11
 
 # Build the wheel.
-RUN python3 -m pip -v wheel --wheel-dir=/socketsocketcan-wheel /socketsocketcan
+RUN uv build --wheel --out-dir=/socketsocketcan-wheel /socketsocketcan
 
 # Make sure the wheel is working.
-RUN python3 -m pip install --no-index --find-links=/socketsocketcan-wheel socketsocketcan
-RUN python3 -c "import socketsocketcan; print(dir(socketsocketcan))"
+RUN uv pip install --no-index --find-links=/socketsocketcan-wheel socketsocketcan
+RUN uv run -- python -c "import socketsocketcan; print(dir(socketsocketcan))"
 
 RUN [ "cross-build-end" ]