fix: added zone to variables

[alebrozzo]

Description

Adds a new variable to infra/variables.tf for the zone and defaults to the region's -a zone

Steps to reproduce: Create a new "Dynamic web application with JavaScript" sample deploy using Terraform CLI

Fixes #80

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Checklist

• Added steps to reproduce the changes in this pull request
• Added relevant testing in this pull request
• Please merge this PR for me once it is approved.

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[rogerthatdev]

Thanks for your contribution @alebrozzo!

The lint check doesn't like that we're declaring a variable for zone without using it:

Warning: variable "zone" is declared but not used (terraform_unused_declarations)

  on variables.tf line 52:
  52: variable "zone" {

See if there are resources that we can use the zone variable and add it there.

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