netboot can try to load shim_certificate_[0..9].efi #973

Job	Run time
f41 x64 build compile_commands.json	2m 52s
f41 x64 build	2m 7s
f40 x64 build	2m 1s
f41 aa64 cross-build	2m 6s
f39 x64 build	2m 4s
f40 aa64 cross-build	2m 0s
centos9 x64 build	1m 14s
f41 arm cross-build	2m 3s
centos8 x64 build	1m 24s
f40 arm cross-build	2m 1s
f39 ia32 build	3m 47s
f39 arm cross-build	1m 57s
centos8 ia32 build	1m 14s
f41 x64 cross-build	2m 6s
f40 x64 cross-build	2m 14s
f39 x64 cross-build	1m 53s
f41 ia32 cross-build	2m 9s
f40 ia32 cross-build	1m 53s
f39 ia32 cross-build	3m 19s
	40m 24s

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