fix(pipeline): do preliminary checks for checksum invalid chars #2891

Job	Run time
Build melange and add to artifact cache	36s
Build packages (bubblewrap, hello-wolfi)	1m 20s
Build packages (bubblewrap, glibc)	13m 28s
Build packages (bubblewrap, tini)	1m 10s
Build packages (bubblewrap, lzo)	1m 28s
Build packages (bubblewrap, bubblewrap)	1m 25s
Build packages (bubblewrap, gitsign)	3m 0s
Build packages (bubblewrap, guac)	3m 50s
Build packages (bubblewrap, mdbook)	3m 52s
Build packages (bubblewrap, s3cmd)	1m 19s
Build packages (bubblewrap, perl-yaml-syck)	1m 12s
Build packages (bubblewrap, ncurses)	2m 20s
Build packages (qemu, hello-wolfi)	1m 45s
Build packages (qemu, glibc)	14m 8s
Build packages (qemu, tini)	2m 1s
Build packages (qemu, lzo)	1m 56s
Build packages (qemu, bubblewrap)	1m 39s
Build packages (qemu, gitsign)	3m 21s
Build packages (qemu, guac)	4m 40s
Build packages (qemu, mdbook)	4m 33s
Build packages (qemu, s3cmd)	1m 35s
Build packages (qemu, perl-yaml-syck)	1m 41s
Build packages (qemu, ncurses)	2m 38s
	1h 14m 57s

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