Instruction file imported from JohnStrunk/infra-containers (.github/instructions/dockerfile.instructions.md). Copyright stays with the author.

Dockerfile rules

• Use minimal base images to reduce image size and attack surface.
• Use multi-stage builds to optimize the final image.
• After editing a Dockerfile, always use hadolint to check for best practices and common mistakes. Fix any issues reported by hadolint.

Linting exceptions

• Use # hadolint ignore=DL3008 or DL3018 to ignore warnings about pinning specific package versions when installing packages with apt-get or similar package managers.