Dockerfile

FROM mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview6-buster

ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=false \
    LC_ALL=en_US.UTF-8 \
    LANG=en_US.UTF-8

# Install .NET Core SDK
ENV DOTNET_SDK_VERSION 3.0.100-preview6

# set up node
ENV NODE_VERSION 12.6.0
RUN curl -SL "https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.gz" --output nodejs.tar.gz \
    && tar -xzf "nodejs.tar.gz" -C /usr/local --strip-components=1 \
    && rm nodejs.tar.gz \
    && ln -s /usr/local/bin/node /usr/local/bin/nodejs
    
# Enable correct mode for dotnet watch (only mode supported in a container)
ENV DOTNET_USE_POLLING_FILE_WATCHER=true \ 
# Skip extraction of XML docs - generally not useful within an image/container - helps performance
    NUGET_XMLDOC_MODE=skip

# Trigger first run experience by running arbitrary cmd to populate local package cache
RUN dotnet help