add dotnet setup from ms instructions

.gitea/workflows/msbuild.yaml

@@ -13,10 +13,18 @@ jobs:
         run: echo "${LOCIP}      gitea.comnenos" >> /etc/hosts
       - uses: actions/checkout@v2
 
+      - name: Setup .NET 7.0
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: '7.0.x'
+
       - name: Where Am I
         shell: bash
         working-directory: ${{runner.workspace}}
-        run: pwd && ls -l && env
+        run: pwd && ls -l && dotnet --info
+      
+#      - name: Install dependencies
+#        run: dotnet add package Newtonsoft.Json --version 12.0.1
                 
       - name: Start Web
         shell: bash