Docker image for NSwag CLI

[philipszalla]

Is your feature request related to a problem? Please describe.

I need to generate C# client classes from an OpenAPI definition. The classes should be generated manually/on purpose using a script.
It's no option to add a pre/post build event with the msbuild package, as the definition is hosted online and developers need the possibility to work offline.
Currently the online way to achieve this would be to download the release manually from GitHub including getting all requirements.

Describe the solution you'd like

Provide a Docker image at a public registry (e.g. hub.docker.com) which executes the NSwag CLI.

Describe alternatives you've considered

Install msbuild package and try to run the dll from the .nuget folder. Is a little bit hacky and requires the dependencies (e.g. dotnet) like this

dotnet ~/.nuget/packages/NSwag.MsBuild/... openapi2csharpclient ...

Additional context

Add any other context or screenshots about the feature request here.