Include prereleases for SDK installs

Author: Turnerj

.github/workflows/build.yml

@@ -43,6 +43,8 @@ jobs:
           dotnet-version: "5.0.x"
       - name: "Install .NET Core SDK"
         uses: actions/[email protected]
+        with:
+          include-prerelease: true
       - name: "Dotnet Tool Restore"
         run: dotnet tool restore
         shell: pwsh