Support building Iron Bank Docker context #65074
Merged
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Backport of #64336.
This PR adds support for building a Docker context for Iron Bank.
It doesn't actually build the image - we could add that at a later
stage, but this is an attempt to automate at least some of the
process.
Iron Bank is a lot like our UBI build, except it uses a hardened
version of the full UBI image, not the minimal UBI image. They have
particular requirements around how the Docker context should be
arranged. The Docker build cannot fetch its own artefacts, but
instead the context provides a descriptor that locates what is
needed for the build.
I also added a filter so that after performing expansions on the
Dockerfile
, we squash long runs on newlines together. This makesthe output cleaner, while allowing us to break up the unprocessed
Dockerfile
for clarity.