ci: test windows clang and gcc

Author: Firestar99

.github/workflows/rust-ci.yml

@@ -46,6 +46,13 @@ jobs:
             target: x86_64-pc-windows-msvc
             # msvc's `-Werror` is `/WX`
             cxxflags: '/WX'
+          - os: windows-2022
+            target: x86_64-pc-windows-msvc
+            cxx: clang++
+            cxxflags: '-Werror'
+          - os: windows-2022
+            target: x86_64-pc-windows-gnu
+            cxxflags: '-Werror'
     runs-on: ${{ matrix.os }}
     env:
       CXX: ${{ matrix.cxx }}
@@ -73,9 +80,9 @@ jobs:
         run: cargo fetch --locked --target $TARGET
       - run: cargo fetch --locked
       - name: cargo test build
-        run: cargo build --tests --release --all-features
+        run: cargo build --tests --release --all-features --target $TARGET
       - name: cargo test
-        run: cargo test --release --all-features
+        run: cargo test --release --all-features --target $TARGET
 
   deny-check:
     name: cargo-deny