tools/create-gce-image.sh: create archive for syz-gce
tools/create-gce-image.sh: create archive for syz-gce

Create archive ready to use with syz-gce (pack disk image,
vmlinux, key and tag into a single tar.gz).
Also use sudo only for specific commands, otherwise we create key
file readable only root which is inconvinient.

xairy/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,zoulasc/syzkaller,zoulasc/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,hyz0906/syzkaller,dotweiba/syzkaller,hyz0906/syzkaller,sploving/syzkaller,sploving/syzkaller,google/syzkaller,hyz0906/syzkaller,hyz0906/syzkaller,xairy/syzkaller,dotweiba/syzkaller,sploving/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,dotweiba/syzkaller,xairy/syzkaller,sploving/syzkaller,zoulasc/syzkaller,dotweiba/syzkaller