Update Cloud Build deployment local-exec step

[zefdelgadillo]

The Cloud Build deployment step, which creates two container images and saves them to artifact registry is failing because of a deprecated gcloud flag cloud_run.tf#L85:

ERROR: (gcloud.builds.submit) unrecognized
│ arguments: --git-source-dir=. (did you mean '--gcs-source-staging-dir'?)

A few options to fix this include:

1. (Quick fix) Remove --git-source-dir=. from the script, then cloud build simply use the local directory for the build.
2. Decouple Cloud Build from Terraform as proposed in Split infrastructure build resources from application build resources #104; we could further consolidate by including Cloud Run deployments into the cloudbuild.yaml file
3. Replace local-exec with a Cloud Build trigger terraform resource