create-squashfs-snapshot: major speedups20240926T054112Z

The old code was slowly building up more and more files, and re-running
checksums of ALL files every pass.

As of 2024/09/25 the full runtime was approaching 134 seconds of which
113 seconds was just the SHA512 re-running over ALL files.

Instead of re-running over all files, produce and KEEP a dated signed
checksum for each day's binary artifacts - then at the end, combine them
with signature verification into the old style of file, so that existing
tools keep working.

Old runtime: 134 seconds
New runtime: 21 seconds

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

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