Build from pinned base image digests - #14
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Replace timestamp tracking with multi-platform digest inputs consumed by local and CI Makefile targets. Preserve version, variant, and stability-tag selection while passing immutable image references to Docker. Document custom base-image builds and reject selections without a pin.
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Builds currently resolve mutable base-image tags independently of update detection. This change makes the Makefiles pass a complete tag-and-digest reference to Docker, so each commit selects the same base image for a given version and variant.
The build inputs live in
base-images.mk, and obsolete timestamp markers are removed where present. Local and CI build targets consume the pins, including supported development and stability variants. Missing pins fail before a build starts.Validation: Makefile dry runs across the pinned references and Dockerfile checks on linux/amd64 and linux/arm64 passed. The pins were resolved from the registry as multi-platform image indexes. Current image CI has passed its full build and test workflow.
Rollout: merge the digest updater first, then this migration. No image release tag is created by this PR.