A floating tag silently substitutes the image under consumers who did not ask
for a new one — the same hazard already avoided by pinning the pre-commit step.
Alias only :<version> onto the default distro's build.
Drop the :latest references from the README, distro.env and check-distros.
Replace the packer-images gobuilder with a Dockerfile matrix built on each
container-base distro image, on a single repo semver.
- install golang, gcc and nfpm
- bake the sha256-pinned go-cache-plugin v0.1.0 binary onto PATH
- run in-image assertions as a --target test build stage
- add pull_request build/test/pre-commit and tag-triggered docker workflows