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Keep the Docker image's toolchain layers stable across releases, and slim them #588

Job	Run time
inspect	4s
workflow-notice	4s
dockerfile-smoke (amd64)	1m 18s
dockerfile-smoke (arm64)	57s
python-sfw-smoke-enterprise	0s
fixture-pypi-sfw-smoke-enterprise	-1s
fixture-npm-sfw-smoke-free	-1s
fixture-npm-sfw-smoke-enterprise	-1s
fixture-pypi-sfw-smoke-free	-1s
python-sfw-smoke-free	-1s
dependency-review-gate	2s
	2m 20s