Dockerfile

FROM arm32v7/buildpack-deps:bionic-scm

ENV \
    # Enable detection of running in a container
    DOTNET_RUNNING_IN_CONTAINER=true \
    # Enable correct mode for dotnet watch (only mode supported in a container)
    DOTNET_USE_POLLING_FILE_WATCHER=true \
    # Skip extraction of XML docs - generally not useful within an image/container - helps performance
    NUGET_XMLDOC_MODE=skip \
    # PowerShell telemetry for docker image usage
    POWERSHELL_DISTRIBUTION_CHANNEL=PSDocker-DotnetCoreSDK-Ubuntu-18.04-arm32

# Install .NET CLI dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        libc6 \
        libgcc1 \
        libgssapi-krb5-2 \
        libicu60 \
        libssl1.1 \
        libstdc++6 \
        zlib1g \
    && rm -rf /var/lib/apt/lists/*

# Install .NET Core SDK
RUN dotnet_sdk_version=3.1.401 \
    && curl -SL --output dotnet.tar.gz https://dotnetcli.azureedge.net/dotnet/Sdk/$dotnet_sdk_version/dotnet-sdk-$dotnet_sdk_version-linux-arm.tar.gz \
    && dotnet_sha512='2c84d8442fd872aafbdff7a1f131c4bacfb75ca69426d2aa2b9f3cf05a8e3a365923c14f7eb732113dd7a9fdc674c955e70817fb355aaabca25b79ed33356a15' \
    && echo "$dotnet_sha512 dotnet.tar.gz" | sha512sum -c - \
    && mkdir -p /usr/share/dotnet \
    && tar -ozxf dotnet.tar.gz -C /usr/share/dotnet \
    && rm dotnet.tar.gz \
    && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet \
    # Trigger first run experience by running arbitrary cmd
    && dotnet help

# Install PowerShell global tool
RUN powershell_version=7.0.3 \
    && curl -SL --output PowerShell.Linux.arm32.$powershell_version.nupkg https://pwshtool.blob.core.windows.net/tool/$powershell_version/PowerShell.Linux.arm32.$powershell_version.nupkg \
    && powershell_sha512='75b2e6e542ac9fd7183d740befc048192c1816804b7de691013b037978775903ae802f2995d149f04bfb61f8982a40705b87cc367286b9d1ebb5fa8f2890c1f6' \
    && echo "$powershell_sha512  PowerShell.Linux.arm32.$powershell_version.nupkg" | sha512sum -c - \
    && mkdir -p /usr/share/powershell \
    && dotnet tool install --add-source / --tool-path /usr/share/powershell --version $powershell_version PowerShell.Linux.arm32 \
    && dotnet nuget locals all --clear \
    && rm PowerShell.Linux.arm32.$powershell_version.nupkg \
    && ln -s /usr/share/powershell/pwsh /usr/bin/pwsh \
    && chmod 755 /usr/share/powershell/pwsh \
    # To reduce image size, remove the copy nupkg that nuget keeps.
    && find /usr/share/powershell -print | grep -i '.*[.]nupkg$' | xargs rm