Dockerfile

# Build from ruby:latest, as it's Debian-based, and keeps us from having to build Ruby from source.
FROM ruby:latest AS base

RUN apt-get update && apt-get install -y \
    curl \
    git \
    && rm -rf /var/lib/apt/lists/*

# Use Bash, and fail on any error.
SHELL ["/bin/bash", "-o", "pipefail", "-c"]

# Install Mise for tool-version management. (https://mise.jdx.dev).
ENV MISE_DATA_DIR="/mise"
ENV MISE_CONFIG_DIR="/mise"
ENV MISE_CACHE_DIR="/mise/cache"
ENV MISE_INSTALL_PATH="/usr/local/bin/mise"
ENV PATH="/mise/shims:$PATH"
RUN curl https://mise.run | sh

# Install Node.js, Python, and Go.

# Node.js version support: https://nodejs.org/en/about/previous-releases
RUN mise install node@25 && \
    mise use --global node@25

# Python version support: https://devguide.python.org/versions/
RUN mise install python@3.14 && \
    mise use --global python@3.14

# Go version support: https://endoflife.date/go
RUN mise install go@1.25 && \
    mise use --global go@1.25

# Ruby version support: https://www.ruby-lang.org/en/downloads/branches/
RUN mise install ruby@3.4 && \
    mise use --global ruby@3.4

# .NET version support: https://dotnet.microsoft.com/en-us/platform/support/policy/dotnet-core
# Install .NET 9 SDK via mise, then add the .NET 8 runtime for multi-TFM test execution.
RUN mise install dotnet@9 && \
    mise use --global dotnet@9 && \
    curl -sSL https://dot.net/v1/dotnet-install.sh | bash -s -- \
      --channel 8.0 --runtime dotnet --install-dir "$(mise where dotnet@9)"

# Install Python tools.
RUN pip install --no-cache-dir uv black
RUN npm install -g nx

# Override the default command (irb).
CMD ["true"]