Add Windows abi3 wheel cross comiplation test

.github/workflows/ci.yml

@@ -271,6 +271,19 @@ jobs:
           target: aarch64-apple-darwin
           args: --release -i python3.9 --no-sdist -m examples/maturin-starter/Cargo.toml
 
+      - name: Test cross compile to Windows
+        if: ${{ matrix.platform.os == 'ubuntu-latest' && matrix.python-version == '3.10' }}
+        run: |
+          sudo apt-get install -y mingw-w64
+          rustup target add x86_64-pc-windows-gnu
+          cargo build --manifest-path examples/maturin-starter/Cargo.toml --features abi3 --target x86_64-pc-windows-gnu
+      - name: Test cross compile to Windows with maturin
+        if: ${{ matrix.platform.os == 'ubuntu-latest' && matrix.python-version == '3.10' }}
+        uses: messense/maturin-action@v1
+        with:
+          target: x86_64-pc-windows-gnu
+          args: --no-sdist -m examples/maturin-starter/Cargo.toml --cargo-extra-args="--features abi3"
+
     env:
       CARGO_TERM_VERBOSE: true
       CARGO_BUILD_TARGET: ${{ matrix.platform.rust-target }}

examples/maturin-starter/Cargo.toml

@@ -10,4 +10,7 @@ crate-type = ["cdylib"]
 [dependencies]
 pyo3 = { path = "../../", features = ["extension-module"] }
 
+[features]
+abi3 = ["pyo3/abi3-py37"]
+
 [workspace]