ci: container: reproducible images #58
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Add the git commit hash to the manifest of each platform image.
Clone the entire history when building containers. That way, we will be able to find an appropriate commit hash and time for the containers subdirectory.
Migrate the local container builder to buildah instead of podman. This will permit us to use the `redhat-actions/buildah-build` GH action, or podman directly, to obtain equivalent results on CI.
In buildah and podman, executing a Dockerfile `COPY` operation respects the *host* user's umask. This causes unwanted variation between build environments. Instead, mount the host filesystem and copy the file with the permissions we want.
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Misc reproducibility fixes for CI container images:
COPYinstructions, which depend on the host umask