Dockerfile

ARG REPO=mcr.microsoft.com/dotnet/core/runtime-deps
FROM $REPO:2.1-alpine3.10

# Disable the invariant mode (set in base image)
RUN apk add --no-cache icu-libs

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 2.1.805

RUN wget -O dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Sdk/$DOTNET_SDK_VERSION/dotnet-sdk-$DOTNET_SDK_VERSION-linux-musl-x64.tar.gz \
    && dotnet_sha512='6eb76f405c339d8d662ad152b9cd9d0a77957f5538d44bbdc0d2c66f5923bd3064ea9fddcd20e2c2e4a7a051f97e0e99fa0a30ca1649f2c0c6ddbfaaf11831d2' \
    && echo "$dotnet_sha512  dotnet.tar.gz" | sha512sum -c - \
    && mkdir -p /usr/share/dotnet \
    && tar -C /usr/share/dotnet -xzf dotnet.tar.gz \
    && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet \
    && rm dotnet.tar.gz

# 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