syz-ci: combine build.ID from both kernel tag and syzkaller commit
syz-ci: combine build.ID from both kernel tag and syzkaller commit

Builds with equal IDs are merged by dashboard,
so if only syzkaller commit has changed
dashboard won't create a new build and the new
syzkaller commit will be lost.

xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller