wip: add windows build

.github/workflows/windows.yml

@@ -0,0 +1,69 @@
+name: windows
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: windows-latest
+    name: (${{ matrix.target }}, ${{ matrix.cfg_release_channel }})
+    env:
+      CFG_RELEASE_CHANNEL: ${{ matrix.cfg_release_channel }}
+    strategy:
+      # https://help.github.com/en/actions/getting-started-with-github-actions/about-github-actions#usage-limits
+      # There's a limit of 60 concurrent jobs across all repos in the rust-lang organization.
+      # In order to prevent overusing too much of that 60 limit, we throttle the
+      # number of rustfmt jobs that will run concurrently.
+      max-parallel: 2
+      fail-fast: false
+      matrix:
+        target: [
+          i686-pc-windows-gnu,
+          i686-pc-windows-msvc,
+          x86_64-pc-windows-gnu,
+          x86_64-pc-windows-msvc,
+        ]
+        cfg_release_channel: [nightly, stable]
+
+    steps:
+    # The Windows runners have autocrlf enabled by default
+    # which causes failures for some of rustfmt's line-ending sensitive tests
+    - name: disable git eol translation
+      run: git config --global core.autocrlf false
+    - name: checkout
+      uses: actions/checkout@v2
+
+      # Run build
+    - name: Install Rustup using win.rustup.rs
+      run: |
+        # Disable the download progress bar which can cause perf issues
+        $ProgressPreference = "SilentlyContinue"
+        Invoke-WebRequest https://win.rustup.rs/ -OutFile rustup-init.exe
+        .\rustup-init.exe -y --default-host=x86_64-pc-windows-msvc --default-toolchain=none
+        del rustup-init.exe
+        rustup target add ${{ matrix.target }}
+      shell: powershell
+
+    - name: Add mingw32 to path for i686-gnu
+      run: |
+        echo "C:\msys64\mingw32\bin" >> $GITHUB_PATH
+      if: matrix.target == 'i686-pc-windows-gnu' && matrix.channel == 'nightly'
+      shell: bash
+
+    - name: Add mingw64 to path for x86_64-gnu
+      run: echo "C:\msys64\mingw64\bin" >> $GITHUB_PATH
+      if: matrix.target == 'x86_64-pc-windows-gnu' && matrix.channel == 'nightly'
+      shell: bash
+
+    - name: build
+      run: |
+        rustc -Vv
+        cargo -V
+        cargo build
+      shell: cmd
+
+    - name: test
+      run: cargo test
+      shell: cmd