Docker teamcity-agent with multi .NET SDKs

Customized Teamcity Agent image Ubuntu 20.04 (Focal Fossa), add more tooks and .NET SDK

Docker Hub and Dockerfile

https://hub.docker.com/r/teslaconsulting/teamcity-agent

Dockerfile on Github https://github.com/teslahub/docker-teamcity-agent

Current version adding tools and SDKs

Update per build.

• TeamCity Agent: 2022.04.7-linux
• .NET 9 SDK: 9.0.100-preview.4.24267.66
• .NET 8 SDK: 8.0.301
• .NET 7 SDK: 7.0.410
• .NET 6 SDK: 6.0.423
• .NET 5 SDK: 5.0.408
• .NETCore 3.1 SDK: 3.1.426
• Powershell Core: 7.5.0-preview.2
• MinVer Cli: 5.0.0
• Docker Compose v2: 2.27.1