Build: Use Docker for Windows cross-compilation on Linux workers

.gitea/workflows/build.yml

@@ -34,26 +34,20 @@ jobs:
           path: dist/tamigo-cli
 
   build-windows:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          
-      - name: Install dependencies
+      - name: Build Windows executable via Docker
         run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.txt
-          
-      - name: Build with PyInstaller
-        run: |
-          pyinstaller --onefile --name tamigo-cli tamigo.py
+          docker run --rm \
+            -v "$(pwd):/src" \
+            cdrx/pyinstaller-windows \
+            "pip install -r requirements.txt && pyinstaller --onefile --name tamigo-cli tamigo.py"
           
       - name: Upload artifact
         uses: actions/upload-artifact@v3
         with:
           name: tamigo-cli-windows
-          path: dist/tamigo-cli.exe
+          # The Docker image puts the output in dist/windows/
+          path: dist/windows/tamigo-cli.exe