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Fixes #14021 Substitution values built from `$(shell ...)` output can easily be empty due to the shell's default `pipefail` behavior. This can also hide non-zero exit codes, similarly resulting in empty values being set. While not a perfect fix, the situation is improved by using the `err_if_empty` function in all cases where empty values would be unexpected. Remove the definitions for `GIT_BRANCH` and `GIT_BRANCH_CLEAN` which don't seem to actually be used anywhere (including in code). Add a simple release-test to verify `podman info` outputs a non-empty value for "GitCommit". Signed-off-by: Chris Evich <cevich@redhat.com>