Add docker file

.dockerignore

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+bin
+obj
+Dockerfile

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
+
+# build application 
+WORKDIR /src/Bot
+COPY . .
+RUN dotnet restore
+RUN dotnet publish -c release -o /app --no-self-contained --no-restore
+
+# final stage/image
+FROM mcr.microsoft.com/dotnet/runtime:5.0
+
+WORKDIR /app
+COPY --from=build /app .
+
+ENTRYPOINT ["./Bot"]