Why Docker Images Are Becoming the Real Supply Chain Boundary
In many real pipelines, teams do not ship source code anymore. They ship container images. Generally, the CI job gets the image and drives it to a registry.
When defining a typical Docker flow, the image is already pre-configured with the runtime, OS packages, and the actual application. Once the build passes, that exact image moves forward. Dev uses it. QA tests it. Production runs it. If a weak dependency or bad layer slips in during the build, it travels the whole path without changing.
This is where many teams get surprised. The repository may look clean, but the image can still carry outdated libraries, risky base layers, or unintended tools added during the build stage. Code review alone will not catch those issues.
In many pipelines, teams don’t stop at reviewing code anymore. They open up the image and check what actually got baked into it. It’s common to...
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