build: fix with .net support

Author: hiddentao

.github/workflows/ci.yml

@@ -17,6 +17,10 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 7.0.x
+
       - uses: retypeapp/action-build@latest
 
       - uses: retypeapp/action-github-pages@latest