Fix copilot-setup workflow by explicitly specifying solution file in dotnet commands#837

BenjaminMichaelis merged 2 commits intov12.0IntelliTect/EssentialCSharp:v12.0from

copilot/fix-bef413d8-4e13-49ee-a502-a19efe5a92adIntelliTect/EssentialCSharp:copilot/fix-bef413d8-4e13-49ee-a502-a19efe5a92adCopy head branch name to clipboard