Binary growth check, part 1 of 2

Add a CI check to prevent unwanted bloat in binary images,
by building a baseline (pre-PR) binary then comparing file
sizes post-PR.

We piggyback onto the existing 'Build Each Commit' CI check
because it gives us an easy way to run 'make' against the
parent commit.

This is part 1 of 2: adding the script, not the Makefile rule.
We can't add the Makefile rule now because the script it would
invoke does not exist in the parent commit.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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