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chore: standardize Docker base images to approved platform images #9

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# Standardized to approved base image
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@loujaybee loujaybee Jan 7, 2026

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📋 Overview: This Dockerfile has been updated to use the approved ubuntu:22.04 base image instead of Microsoft's dev container base.

Testing checklist:

  • Rebuild the dev container and verify it starts successfully
  • Check that all required tools are available (git, docker, docker-compose, etc.)
  • Verify file permissions work correctly
  • Test that the docker-compose services start as expected
  • Confirm the user context is correct (root vs non-root)

Note: The devcontainer.json currently doesn't specify a remoteUser, so it will default to root with the new base image. This is different from the Microsoft base which defaulted to the vscode user.

FROM ubuntu:22.04
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@loujaybee loujaybee Jan 7, 2026

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ℹ️ Info: Updated from mcr.microsoft.com/devcontainers/base:ubuntu-24.04 to ubuntu:22.04.

Key differences:

  • Version change: Ubuntu 24.04 → 22.04 LTS (Long Term Support until 2027)
  • Base image source: Microsoft's dev container base → Official Ubuntu base
  • Pre-installed tools: The Microsoft base includes common dev tools (git, curl, wget, etc.). The official Ubuntu base is minimal and may require installing these tools.

What changed:

  • Microsoft's base includes a non-root vscode user with sudo access
  • Official Ubuntu 22.04 only has the root user by default
  • If your devcontainer.json relies on the vscode user or pre-installed tools, you may need to add RUN commands to install them

👀 Review: Check if your devcontainer.json has remoteUser set to vscode - you may need to create this user or change to root.


# use this Dockerfile to install additional tools you might need, e.g.
# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
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@loujaybee loujaybee Jan 7, 2026

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✅ Good news: The apt-get package manager works with ubuntu:22.04 since both the old and new base images are Debian-based.

ℹ️ Info: Common packages you might need to install for dev container functionality:

RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
    && apt-get -y install --no-install-recommends \
        git \
        curl \
        wget \
        ca-certificates \
        sudo \
    && apt-get clean && rm -rf /var/lib/apt/lists/*

⚠️ Check: If you need to create a non-root user (like the vscode user from the Microsoft base), add:

RUN useradd -m -s /bin/bash vscode \
    && echo "vscode ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/vscode \
    && chmod 0440 /etc/sudoers.d/vscode

# && apt-get -y install --no-install-recommends <your-package-list-here>