[ci] Add release to workflow.

.github/workflows/build.yml

@@ -9,8 +9,8 @@ jobs:
     strategy:
       matrix:
         platform:
-        - { name: Linux GCC }
-        - { name: Windows MINGW, make_opts: PLATFORM=NT CROSS_COMPILE=x86_64-w64-mingw32- }
+        - { name: linux_gcc }
+        - { name: windows_mingw, make_opts: PLATFORM=NT CROSS_COMPILE=x86_64-w64-mingw32- }
 
     steps:
     - uses: actions/checkout@v3
@@ -62,3 +62,24 @@ jobs:
       with:
         name: geometry-win32-x86_64 
         path: dist/
+
+  release:
+
+    runs-on: ubuntu-latest
+    needs: [jobs, win32-build-x86_64-geometry]
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      -name: Download artifacts
+      uses: actions/[email protected]
+      -name: Create release
+      uses: softprops/action-gh-release@v1
+      env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        name: Switchres ${GITHUB_REF#refs/*/}
+        draft: true
+        prerelease: false
+        files: |
+          ./switchres-linux_gcc-x86_64/*.zip
+          ./switchres-windows_mingw/*.zip
+          ./geometry-win32-x86_64/*.zip