timeout parameter for disk export

[AndCycle]

just suggestion, some disk might takes extra time to finish the job.

gcloud alpha compute images export

-timeout=TIMEOUT; default="2h"
Maximum time a build can last before it fails as "TIMEOUT". For example, specifying 2h fails the process after 2 hours. See $ gcloud topic datetimes for information about duration formats.

[biofer76]

good suggestion, I will take care of it. Thanks