docker-container-development

Imported from werlang/autojudge-extension (.agents/skills/docker-container-development/SKILL.md). Install upstream with npx skills add werlang/autojudge-extension --skill docker-container-development. Copyright stays with the author.

Docker Container Development

Use this skill whenever a task needs to run project tooling in this repository.

Container Contract

• The Compose service for development commands is extension.
• Start or refresh the environment with docker compose up -d --build from the repository root.
• Run repository tooling inside the running container with docker compose exec extension ....
• Do not run node, npm, npx, vitest, or other project binaries directly on the host machine.
• Prefer commands that execute from /app, which is the bind-mounted repository root inside the container.

Workflow

1. Confirm the Compose environment is up before running project commands.
2. Install dependencies with docker compose exec extension npm install when package.json changed.
3. Run targeted project commands through docker compose exec extension ....
4. If a command needs a shell pipeline or quoting, use docker compose exec extension sh -lc "...".
5. Report the exact containerized command used for validation.

Validation Rules

• Prefer the narrowest honest containerized command for the touched area.
• If a task changes Node-based behavior, validation must happen in the extension container.
• If the container is not running, bring it up instead of falling back to host execution.