feat(terraform): automate firestore setup

[grayside]

Fixes #114

This change is based on proven work in another project. I did not test as part of Emblem because our current Emblem Terraform setup is not compatible with how I understand how to test Terraform. Sending PR to get reviews started, but flagging as do-not-merge for now while I sort out what needs to happen.

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[dinagraves]

This should be a variable.

Suggested change

	location_id = "us-central"
	location_id = var.google_region

[grayside]

Once I saw this suggestion in code, I realized this is a problem. Terraform expects app engine regions in a different formation, e.g., us-central. At the same time, Cloud Run expects standard regions us-central1.

From https://cloud.google.com/appengine/docs/locations it looks like we can adapt the Cloud Run region to App Engine by removing the numeric suffix. I'll need to investigate string manipulation options in Terraform.

@dinagraves should the comment above location_id be more emphatic? Even seeing it in the GitHub UI neither of us noticed it providing critical context to this discussion.

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[dinagraves]

Can you add what this is expected to return?

[grayside]

Overhauled the comment.

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