A minimal Alpine image using a self-contained .NET executable built with mkbundle.

mkbundle-alpine-example.Dockerfile

FROM alpine
RUN echo 'using System; \
namespace Program { \
  public class MyClass { \
    public static void Main(string[] args) { \
      Console.WriteLine ("Hello from C#"); \
    } \
  } \
}' >> Program.cs
RUN apk add  --virtual build-dependencies --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing --no-cache mono mono-dev musl-dev binutils gcc && \
    csc Program.cs && \
    mkbundle --deps --static --config /etc/mono/config -L /usr/lib/mono/4.5 -o program Program.exe /usr/lib/mono/4.5/mscorlib.dll /usr/lib/mono/4.5/System.dll && \
    apk del build-dependencies && \
    apk add --no-cache libgcc