Added dockerfile for running the bot

.dockerignore

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+.git
+.gitignore
+.env
+LICENSE
+README.md

Dockerfile

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+FROM mcr.microsoft.com/dotnet/core/sdk:2.2-alpine AS build
+WORKDIR /app
+
+# copy csproj and restore as distinct layers
+COPY *.csproj ./image-search-bot/
+WORKDIR /app/image-search-bot
+RUN dotnet restore
+
+# copy and publish app and libraries
+WORKDIR /app/
+COPY ./ ./image-search-bot/
+WORKDIR /app/image-search-bot
+RUN dotnet publish -c Release -o out
+
+# run application
+FROM mcr.microsoft.com/dotnet/core/runtime:2.2-alpine AS runtime
+WORKDIR /app
+COPY --from=build /app/image-search-bot/out ./
+CMD dotnet image-search-bot.dll