Build script downloads .NET 5.0

Author: colinangusmackay

.github/workflows/build.yml

@@ -65,9 +65,14 @@ jobs:
           echo "Is Stable: $STRAVAIG_IS_STABLE"
           
       - uses: actions/setup-dotnet@v1
-        name: Setup .NET Core
+        name: Setup .NET Core 3.1
         with:
-          dotnet-version: 3.1.405
+          dotnet-version: 3.1.x
+
+      - uses: actions/setup-dotnet@v1
+        name: Setup .NET 5.0
+        with:
+          dotnet-version: 5.0.x
 
       - name: Build Solution
         run: dotnet build $STRAVAIG_SOLUTION --configuration Release