Adding docker and workflows

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env
+WORKDIR /App
+
+# Copy everything
+COPY . ./
+# Restore as distinct layers
+RUN dotnet restore
+# Build a release
+RUN dotnet build -c Release -o out
+
+# Build runtime image
+FROM mcr.microsoft.com/dotnet/aspnet:6.0
+RUN apt update && apt install -y libopus-dev opus-tools
+WORKDIR /App
+COPY --from=build-env /App/out .
+ENTRYPOINT ["dotnet", "Kasbot.dll"]