fix(pipeline): do preliminary checks for checksum invalid chars #2890

Job	Run time
Build melange and add to artifact cache	41s
Build packages (bubblewrap, hello-wolfi)	1m 33s
Build packages (bubblewrap, glibc)	13m 35s
Build packages (bubblewrap, tini)	1m 10s
Build packages (bubblewrap, lzo)	1m 39s
Build packages (bubblewrap, bubblewrap)	1m 10s
Build packages (bubblewrap, gitsign)	2m 43s
Build packages (bubblewrap, guac)	3m 46s
Build packages (bubblewrap, mdbook)	3m 49s
Build packages (bubblewrap, s3cmd)	1m 9s
Build packages (bubblewrap, perl-yaml-syck)	1m 27s
Build packages (bubblewrap, ncurses)	2m 16s
Build packages (qemu, hello-wolfi)	2m 20s
Build packages (qemu, glibc)	14m 18s
Build packages (qemu, tini)	1m 43s
Build packages (qemu, lzo)	2m 21s
Build packages (qemu, bubblewrap)	1m 44s
Build packages (qemu, gitsign)	3m 23s
Build packages (qemu, guac)	4m 44s
Build packages (qemu, mdbook)	4m 49s
Build packages (qemu, s3cmd)	1m 53s
Build packages (qemu, perl-yaml-syck)	1m 57s
Build packages (qemu, ncurses)	2m 50s
	1h 17m 0s

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