Add binaries for our Rust demos in a Torizon container

.dockerignore

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+target
+.git

.github/workflows/torizon_demos.yaml

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+# Copyright © SixtyFPS GmbH <info@slint-ui.com>
+# SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
+
+name: Rust Demos built for Torizon
+
+on:
+  workflow_dispatch:
+    inputs:
+      push:
+        type: boolean
+        description: "Push the built images"
+  workflow_call:
+    inputs:
+      push:
+        type: boolean
+        description: "Push the built images"
+
+jobs:
+  build_containers:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        include:
+          - target: armhf
+            image_arch: linux/arm/v7
+            rust_toolchain_arch: armv7-unknown-linux-gnueabihf
+          - target: arm64
+            image_arch: linux/arm64
+            rust_toolchain_arch: aarch64-unknown-linux-gnu
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.CR_PAT }}
+    - name: Build and push
+      uses: docker/build-push-action@v3
+      with:
+        context: .
+        file: ./docker/Dockerfile.torizon-demos
+        push: ${{ github.event.inputs.push || inputs.push }}
+        tags: ghcr.io/slint-ui/slint/slint-torizon-demos-${{matrix.target}}:latest
+        build-args: |
+          TOOLCHAIN_ARCH=${{matrix.target}}
+          IMAGE_ARCH=${{matrix.image_arch}}
+          RUST_TOOLCHAIN_ARCH=${{matrix.rust_toolchain_arch}}

docker/Dockerfile.torizon-demos

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+# This docker file builds the Rust binaries of our demos and packages them into a Torizon container
+
+ARG TOOLCHAIN_ARCH=arm64
+ARG IMAGE_ARCH=linux/arm64
+ARG BASE_NAME=wayland-base
+FROM torizon/debian-cross-toolchain-$TOOLCHAIN_ARCH:2-bullseye AS build
+ARG TOOLCHAIN_ARCH
+ARG RUST_TOOLCHAIN_ARCH=aarch64-unknown-linux-gnu
+
+# Install Rust
+ENV RUSTUP_HOME=/rust
+ENV CARGO_HOME=/cargo 
+ENV PATH=/cargo/bin:/rust/bin:$PATH
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
+RUN rustup target add $RUST_TOOLCHAIN_ARCH
+
+ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc
+ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc
+
+# Install Slint build dependencies (libxcb, etc.)
+RUN apt-get update && \
+    apt-get install --assume-yes libfontconfig1-dev:$TOOLCHAIN_ARCH libxcb1-dev:$TOOLCHAIN_ARCH libxcb-render0-dev:$TOOLCHAIN_ARCH libxcb-shape0-dev:$TOOLCHAIN_ARCH libxcb-xfixes0-dev:$TOOLCHAIN_ARCH libxkbcommon-dev:$TOOLCHAIN_ARCH python3 clang libstdc++-10-dev:$TOOLCHAIN_ARCH && \
+    rm -rf /var/lib/apt/lists/*
+
+# Don't require font-config when the compiler runs
+ENV RUST_FONTCONFIG_DLOPEN=on
+
+# Build Demos
+COPY . /slint
+WORKDIR /slint
+RUN mkdir demos \
+    && for demo in printerdemo slide_puzzle gallery opengl_underlay carousel todo; do \
+        cargo build --release --target $RUST_TOOLCHAIN_ARCH --features slint/renderer-winit-skia -p $demo; \
+        cp target/$RUST_TOOLCHAIN_ARCH/release/$demo ./demos/; \
+   done
+
+# Create container for target
+FROM --platform=$IMAGE_ARCH torizon/$BASE_NAME:2
+
+RUN apt-get update \
+    && apt-get install libfontconfig1 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=build /slint/demos/* /usr/bin/
+
+ENV SLINT_FULLSCREEN=1
+ENV SLINT_BACKEND=winit-skia
+CMD /usr/bin/printerdemo