fix msbuild path

.github/workflows/main.yml

@@ -13,6 +13,9 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
-
+        
+      - name: setup-msbuild
+        uses: microsoft/setup-msbuild@v1
+        
       - name: Build Driver
         run: msbuild /t:build Sandboxdrv.sln /p:Configuration="SbieRelease" /p:Platform="x64"