First CI test

.github/actions/setup/action.yml

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+name: Setup
+description: Set up CI environment for Rust + 3DS development
+
+inputs:
+  toolchain:
+    description: The Rust toolchain to use for the steps
+    required: true
+    default: nightly
+
+runs:
+  using: composite
+  steps:
+    # https://github.com/nektos/act/issues/917#issuecomment-1074421318
+    - if: ${{ env.ACT }}
+      shell: bash
+      name: Hack container for local development
+      run: |
+          curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
+          sudo apt-get install -y nodejs
+
+    - name: Setup default Rust toolchain
+      # Use this helper action so we get matcher support
+      # https://github.com/actions-rust-lang/setup-rust-toolchain/pull/15
+      uses: actions-rust-lang/setup-rust-toolchain@v1
+      with:
+        components: clippy, rustfmt, rust-src
+        toolchain: ${{ inputs.toolchain }}
+
+    - name: Install build tools for host
+      shell: bash
+      run: sudo apt-get update && sudo apt-get install -y build-essential
+
+    - name: Set PATH to include devkitARM
+      shell: bash
+      # For some reason devkitARM/bin is not part of the default PATH in the container
+      run: echo "${DEVKITARM}/bin" >> $GITHUB_PATH

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+env:
+  # https://blog.rust-lang.org/2022/06/22/sparse-registry-testing.html
+  CARGO_UNSTABLE_SPARSE_REGISTRY: "true"
+  # actions-rust-lang/setup-rust-toolchain sets some default RUSTFLAGS
+  RUSTFLAGS: ""
+
+jobs:
+  lint:
+    strategy:
+      matrix:
+        toolchain:
+          # Run against a "known good" nightly
+          - nightly-2023-01-13
+          # Check for breakage on latest nightly
+          - nightly
+
+    # But if latest nightly fails, allow the workflow to continue
+    continue-on-error: ${{ matrix.toolchain == 'nightly' }}
+    runs-on: ubuntu-latest
+    container: devkitpro/devkitarm
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v2
+
+      - uses: ./.github/actions/setup
+        with:
+          toolchain: ${{ matrix.toolchain }}
+
+      - name: Hide duplicate warnings from lint job
+        if: ${{ matrix.toolchain == 'nightly' }}
+        run: |
+          echo "::remove-matcher owner=clippy::"
+          echo "::remove-matcher owner=rustfmt::"
+
+      - name: Check formatting
+        run: cargo fmt --all --verbose -- --check
+
+      - name: Cargo check
+        run: cargo 3ds clippy --color=always --verbose --all-targets
+        # --deny=warnings would be nice, but can easily break CI for new clippy
+        # lints getting added. I'd also like to use Github's "inline warnings"
+        # feature, but https://github.com/actions/runner/issues/2341 means we
+        # can't have both that *and* colored output.
+
+  project-build:
+    strategy:
+      matrix:
+        toolchain:
+          - nightly-2023-01-13
+          - nightly
+    continue-on-error: ${{ matrix.toolchain == 'nightly' }}
+    runs-on: ubuntu-latest
+    container: devkitpro/devkitarm
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v2
+
+      - uses: ./.github/actions/setup
+        with:
+          toolchain: ${{ matrix.toolchain }}
+
+      - name: Hide duplicated warnings from lint job
+        run: echo "::remove-matcher owner=clippy::"
+      
+      - name: Install cargo-3ds
+        uses: actions-rs/cargo@v1
+        with:
+          command: install
+          args: --path .
+
+      - name: Create new project
+        run: cargo 3ds new app --bin
+      
+      - name: Build project
+        working-directory: ./app
+        run: cargo 3ds build --release