ci: cross build Windows release on Linux

.gitea/workflows/build-windows-cross-linux.yml

@@ -0,0 +1,116 @@
+name: Cross Build Windows Release on Linux
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  cross-build-windows:
+    # Gitea act_runner 常见 Linux 标签；该工作流在 Linux Runner 中交叉编译 Windows x86_64 包。
+    runs-on: ubuntu-latest
+    container:
+      image: fedora:41
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install cross build dependencies
+        run: |
+          set -euo pipefail
+          dnf install -y \
+            git \
+            cmake \
+            ninja-build \
+            p7zip \
+            p7zip-plugins \
+            mingw64-gcc-c++ \
+            mingw64-qt6-qtbase \
+            mingw64-qt6-qtbase-devel \
+            mingw64-opencv \
+            mingw64-opencv-devel
+
+      - name: Configure
+        run: |
+          set -euo pipefail
+          cmake -S . -B build-windows-cross -G Ninja \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_TOOLCHAIN_FILE=/usr/share/mingw/toolchain-mingw64.cmake
+
+      - name: Build
+        run: |
+          set -euo pipefail
+          cmake --build build-windows-cross --parallel "$(nproc)"
+
+      - name: Package
+        run: |
+          set -euo pipefail
+          APP_NAME="chengnan"
+          PACKAGE_NAME="chengnan-windows-x86_64-cross"
+          PACKAGE_DIR="dist-windows-cross/${PACKAGE_NAME}"
+          EXE="build-windows-cross/${APP_NAME}.exe"
+
+          test -f "$EXE"
+          rm -rf dist-windows-cross
+          mkdir -p "$PACKAGE_DIR"
+          cp "$EXE" "$PACKAGE_DIR/"
+
+          # 收集 MinGW 运行时、Qt、OpenCV 依赖 DLL。
+          for round in 1 2 3; do
+            while IFS= read -r binary; do
+              while IFS= read -r dll; do
+                [ -f "$dll" ] || continue
+                cp -n "$dll" "$PACKAGE_DIR/" || true
+              done < <(x86_64-w64-mingw32-objdump -p "$binary" \
+                | awk '/DLL Name:/ {print $3}' \
+                | while read -r name; do \
+                    find /usr/x86_64-w64-mingw32/sys-root/mingw/bin -iname "$name" -print -quit; \
+                  done)
+            done < <(find "$PACKAGE_DIR" -maxdepth 1 -type f \( -name '*.exe' -o -name '*.dll' \) | sort)
+          done
+
+          # Qt 平台插件是 Windows Qt GUI 程序启动所必需的。
+          QT_PLUGIN_ROOT="/usr/x86_64-w64-mingw32/sys-root/mingw/lib/qt6/plugins"
+          if [ -d "$QT_PLUGIN_ROOT/platforms" ]; then
+            mkdir -p "$PACKAGE_DIR/platforms"
+            cp -n "$QT_PLUGIN_ROOT/platforms"/*.dll "$PACKAGE_DIR/platforms/"
+          fi
+
+          cat > "$PACKAGE_DIR/README.txt" <<'EOF'
+          chengnan Windows x86_64 交叉编译发布包
+
+          运行方式：
+          1. 解压整个目录。
+          2. 双击 chengnan.exe 运行。
+
+          说明：
+          - 本目录由 Linux Runner 使用 MinGW-w64 交叉编译生成。
+          - 请不要只复制 chengnan.exe，需保留同目录 DLL 和 platforms 子目录。
+          EOF
+
+          (cd dist-windows-cross && 7z a -tzip "${PACKAGE_NAME}.zip" "${PACKAGE_NAME}" >/dev/null)
+          (cd dist-windows-cross && sha256sum "${PACKAGE_NAME}.zip" > "${PACKAGE_NAME}.zip.sha256")
+
+      - name: Verify package
+        run: |
+          set -euo pipefail
+          test -s dist-windows-cross/chengnan-windows-x86_64-cross.zip
+          sha256sum -c dist-windows-cross/chengnan-windows-x86_64-cross.zip.sha256
+          7z l dist-windows-cross/chengnan-windows-x86_64-cross.zip | grep 'chengnan.exe'
+          7z l dist-windows-cross/chengnan-windows-x86_64-cross.zip | grep 'platforms/'
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: chengnan-windows-x86_64-cross
+          path: |
+            dist-windows-cross/chengnan-windows-x86_64-cross.zip
+            dist-windows-cross/chengnan-windows-x86_64-cross.zip.sha256
+          if-no-files-found: error