Adding resource "azurerm_static_web_app_build" to set environment variables for Preview Environment

[lee0210]

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Description

This pull request introduces a new resource, azurerm_static_web_app_build, designed to configure environment variables specifically for the preview environment of a static web app. The existing azurerm_static_web_app resource only supports setting environment variables for the production environment via the app_settings property.

Below is an example of how to use the resource.

resource "azurerm_static_web_app_build" "preview" {
  name                     = azurerm_static_web_app.this.name
  resource_group_name      = azurerm_resource_group.this.name
  build                    = "preview"
  environment_variables    = {
    "X_API_KEY" = "API Key"
  }
}

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
• I have written new tests for my resource or datasource changes & updated any relevent documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
• (For changes that include a state migration only). I have manually tested the migration path between relevant versions of the provider.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Because it needs to deploy something to the Static Web to create a preview environment, which is not currently supported without SWA or AZ cli, the tests are done manually. Please find the test evidence below.

Create a new resource

Destroy a resource

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_resource - support for the thing1 property [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.