syz-ci: don't rebuild syzkaller if commit has not changed
syz-ci: don't rebuild syzkaller if commit has not changed

zoulasc/syzkaller,xairy/syzkaller,zoulasc/syzkaller,google/syzkaller,xairy/syzkaller,dotweiba/syzkaller,xairy/syzkaller,dotweiba/syzkaller,zoulasc/syzkaller,dotweiba/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,zoulasc/syzkaller,google/syzkaller,google/syzkaller,dotweiba/syzkaller,google/syzkaller