Add workflow

Author: kuba160

.github/workflows/windowsbuild.yml

@@ -0,0 +1,24 @@
+name: Build for Windows
+on: [ push, pull_request ]
+jobs:
+  build_windows:
+    name: CI for Windows
+    runs-on: windows-latest
+    steps:
+    - name: Checkout for Windows
+      uses: actions/checkout@v2
+    - name: Install msys2
+      uses: msys2/setup-msys2@v2
+      with:
+        update: true
+        install: >-
+          mingw-w64-x86_64-clang mingw-w64-x86_64-cmake mingw-w64-x86_64-lld mingw-w64-x86_64-ninja
+    - name: Build for Windows
+      shell: msys2 {0}
+      run: ./build.sh
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: ddb-xdispatch-win-latest
+        path: out
+

build.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+OUT_DIR="`pwd`/out/xdispatch_ddb"
+
+mkdir build out
+cd build
+LDFLAGS+=" -fuse-ld=lld" \
+cmake -DCMAKE_INSTALL_PREFIX="$OUT_DIR" \
+	  -DCMAKE_C_COMPILER="clang" \
+      -DCMAKE_CXX_COMPILER="clang++" \
+      -DCMAKE_BUILD_TYPE=Release \
+      ..
+ninja
+cmake --install .
+
+mv "$OUT_DIR/bin/"* "$OUT_DIR/lib/"
+rmdir "$OUT_DIR/bin"