Get remote files using ADD example

[devynspencer]

• [ ] when to use wget etc vs ADD vs COPY
• [ ] Specifying a file checksum
• [ ] Avoiding redownloading the same file
• [ ] Cloning git repos

Resources

• https://docs.docker.com/build/building/best-practices/#add-or-copy

[devynspencer]

Factorio server binary example following this example for multi-stage builds:

# syntax=docker/dockerfile:1

FROM scratch AS src
ARG DOTNET_VERSION=8.0.0-preview.6.23329.7
ADD --checksum=sha256:270d731bd08040c6a3228115de1f74b91cf441c584139ff8f8f6503447cebdbb \
    https://dotnetcli.azureedge.net/dotnet/Runtime/$DOTNET_VERSION/dotnet-runtime-$DOTNET_VERSION-linux-arm64.tar.gz /dotnet.tar.gz

FROM mcr.microsoft.com/dotnet/runtime-deps:8.0.0-preview.6-bookworm-slim-arm64v8 AS installer

# Retrieve .NET Runtime
RUN --mount=from=src,target=/src <<EOF
mkdir -p /dotnet
tar -oxzf /src/dotnet.tar.gz -C /dotnet
EOF

FROM mcr.microsoft.com/dotnet/runtime-deps:8.0.0-preview.6-bookworm-slim-arm64v8

COPY --from=installer /dotnet /usr/share/dotnet
RUN ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet