DAOSGCP-161 Fix setting the --region parameter

[agayardo]

This fixes the following error while building an image:

$ ./build_daos_io500_images.sh -t all -i false -f -w projects/my-project/locations/us-central1/workerPools/build-pool-1
[INFO ] Building DAOS disk images for IO500

[INFO ] Temp directory for image building: /tmp/tmp.QZtFLQeShK
[INFO ] Building DAOS server image: daos-server-io500-centos-7
[INFO ] Building DAOS Image(s)
[INFO ] Packer will be using service account serviceAccount:805869098137@cloudbuild.gserviceaccount.com
[INFO ] Using build worker pool projects/my-project/locations/us-central1/workerPools/build-pool-1, region
[INFO ] Building server image
Creating temporary tarball archive of 12 file(s) totalling 38.5 KiB before compression.
Uploading tarball of [.] to [gs://my-project_cloudbuild/source/1677693367.658952-458724d827ce43e4a5c8ffbef94d79ef.tgz]
ERROR: (gcloud.builds.submit) Invalid value for [--region]: --region flag required when workerpool resource includes region substitution

This is because the region is parsed out as empty, which seems to be a regression introduced in the previous commit.

[mark-olson]

Thank you @agayardo

I created a JIRA ticket for this issue.
https://daosio.atlassian.net/browse/DAOSGCP-161

We like to have a JIRA ticket for each commit.

Can you amend the commit message so that it begins with the ticket number DAOSGCP-161?

Also, can you change the PR so that it merges to the develop branch instead of main?

We always merge to develop first. When all changes are ready to be included in a release we merge to main and tag.

Thanks again!

[mark-olson]

Looks good! Thank you!