qt6: Build with mingw as well in CI to avoid accidentally breaking mi…

…ngw build

We dont ship the mingw build, but we want to make sure that it continues to build
and not accidentally break it.

.github/workflows/ci.yml

@@ -181,8 +181,8 @@ jobs:
           path: out/Seamly2D-macos.zip
           if-no-files-found: error
 
-  windows:
-    name: 'Windows: Build'
+  windows-msvc:
+    name: 'Windows: Build with msvc'
     runs-on: windows-latest
     needs: version
     env:
@@ -254,10 +254,78 @@ jobs:
           path: Seamly2D-windows.zip
           if-no-files-found: error
 
+  windows-mingw:
+    name: 'Windows: Build with mingw'
+    runs-on: windows-latest
+    needs: version
+    env:
+      VERSION_NUMBER: ${{ needs.version.outputs.version_number }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: jurplel/install-qt-action@v3
+        with:
+          version: ${{ env.QT_VERSION }}
+          cache: true
+          arch: 'win64_mingw'
+          modules: qt5compat qtmultimedia
+
+      - name: update version
+        shell: bash
+        run: |
+          ./scripts/version.sh ${VERSION_NUMBER}
+
+      - name: make seamly2d.exe and seamlyme.exe
+        run: |
+          qmake.exe Seamly2D.pro -config release CONFIG+=noTests
+          mingw32-make
+
+      - name: create seamly2d-installer.exe
+        # copy seamly2d and seamlyme directory trees prepared by windeployqt and create installer
+        # uses parameters in seamly2d-installer.nsi to create the installer exe
+        run: |
+          mkdir ..\windows-build
+          Copy-Item -Path 'src\app\seamly2d\bin\*' -Destination ..\windows-build -Recurse
+          Copy-Item -Path 'src\app\seamlyme\bin\*' -Destination ..\windows-build -Recurse -Force
+          Copy-Item -Path dist\seamly2d-installer.nsi -Destination ..\windows-build
+          cd ..\windows-build\
+          & 'C:\Program Files (x86)\NSIS\makensis.exe' seamly2d-installer.nsi
+
+      - name: setup signing
+        id: setup_signing
+        uses: timheuer/[email protected]
+        env:
+          PFX_BASE64: ${{ secrets.pfx_base64 }}
+        if: ${{ env.PFX_BASE64 }}
+        with:
+          encodedString: ${{ secrets.pfx_base64 }}
+          fileName: seamly2d.pfx
+
+      - name: sign installer
+        env:
+          PFX_BASE64: ${{ secrets.pfx_base64 }}
+        if: ${{ env.PFX_BASE64 }}
+        run: |
+          cd ..\windows-build\
+          SignTool sign /fd SHA256 /f ${{ steps.setup_signing.outputs.filePath }} /p ${{ secrets.pfx_password }} /t http://timestamp.sectigo.com Seamly2D-installer.exe
+
+      - name: pack installer file into .zip
+        run: |
+          cd ..\windows-build\
+          C:\"Program Files"\7-Zip\7z.exe a Seamly2D-windows-mingw.zip Seamly2D-installer.exe
+          copy Seamly2D-windows-mingw.zip ..\Seamly2D\
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: Seamly2D-windows-mingw.zip
+          path: Seamly2D-windows-mingw.zip
+          if-no-files-found: error
+
   publish:
     if: false
     runs-on: ubuntu-latest
-    needs: [version, windows, linux, macos]
+    needs: [version, windows-msvc, linux, macos]
     env:
       VERSION_NUMBER: ${{ needs.version.outputs.version_number }}