feat(workflows): add user_env_vars field + tests (#9342) (#584)

[upstream:c7d666dda8261136feeb282fdd84c8fad3f586ce]

Signed-off-by: Modular Magician <[email protected]>

workflow_beta/backing_file.tf

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+# This file has some scaffolding to make sure that names are unique and that
+# a region and zone are selected when you try to create your Terraform resources.
+
+locals {
+  name_suffix = "${random_pet.suffix.id}"
+}
+
+resource "random_pet" "suffix" {
+  length = 2
+}
+
+provider "google" {
+  region = "us-central1"
+  zone   = "us-central1-c"
+}

workflow_beta/main.tf

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+resource "google_service_account" "test_account" {
+  provider     = google-beta
+  account_id   = "my-account-${local.name_suffix}"
+  display_name = "Test Service Account"
+}
+
+resource "google_workflows_workflow" "example_beta" {
+  provider      = google-beta
+  name          = "workflow_beta-${local.name_suffix}"
+  region        = "us-central1"
+  description   = "Magic"
+  service_account = google_service_account.test_account.id
+  labels = {
+    env = "test"
+  }
+  user_env_vars = {
+    foo = "BAR"
+  }
+  source_contents = <<-EOF
+  # This is a sample workflow. You can replace it with your source code.
+  #
+  # This workflow does the following:
+  # - reads current time and date information from an external API and stores
+  #   the response in currentTime variable
+  # - retrieves a list of Wikipedia articles related to the day of the week
+  #   from currentTime
+  # - returns the list of articles as an output of the workflow
+  #
+  # Note: In Terraform you need to escape the $$ or it will cause errors.
+
+  - getCurrentTime:
+      call: http.get
+      args:
+          url: https://timeapi.io/api/Time/current/zone?timeZone=Europe/Amsterdam
+      result: currentTime
+  - readWikipedia:
+      call: http.get
+      args:
+          url: https://en.wikipedia.org/w/api.php
+          query:
+              action: opensearch
+              search: $${currentTime.body.dayOfWeek}
+      result: wikiResult
+  - returnOutput:
+      return: $${wikiResult.body[1]}
+EOF
+}

workflow_beta/motd

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+===
+
+These examples use real resources that will be billed to the
+Google Cloud Platform project you use - so make sure that you
+run "terraform destroy" before quitting!
+
+===

workflow_beta/tutorial.md

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+# Workflow Beta - Terraform
+
+## Setup
+
+<walkthrough-author name="[email protected]" analyticsId="UA-125550242-1" tutorialName="workflow_beta" repositoryUrl="https://github.com/terraform-google-modules/docs-examples"></walkthrough-author>
+
+Welcome to Terraform in Google Cloud Shell! We need you to let us know what project you'd like to use with Terraform.
+
+<walkthrough-project-billing-setup></walkthrough-project-billing-setup>
+
+Terraform provisions real GCP resources, so anything you create in this session will be billed against this project.
+
+## Terraforming!
+
+Let's use {{project-id}} with Terraform! Click the Cloud Shell icon below to copy the command
+to your shell, and then run it from the shell by pressing Enter/Return. Terraform will pick up
+the project name from the environment variable.
+
+```bash
+export GOOGLE_CLOUD_PROJECT={{project-id}}
+```
+
+After that, let's get Terraform started. Run the following to pull in the providers.
+
+```bash
+terraform init
+```
+
+With the providers downloaded and a project set, you're ready to use Terraform. Go ahead!
+
+```bash
+terraform apply
+```
+
+Terraform will show you what it plans to do, and prompt you to accept. Type "yes" to accept the plan.
+
+```bash
+yes
+```
+
+
+## Post-Apply
+
+### Editing your config
+
+Now you've provisioned your resources in GCP! If you run a "plan", you should see no changes needed.
+
+```bash
+terraform plan
+```
+
+So let's make a change! Try editing a number, or appending a value to the name in the editor. Then,
+run a 'plan' again.
+
+```bash
+terraform plan
+```
+
+Afterwards you can run an apply, which implicitly does a plan and shows you the intended changes
+at the 'yes' prompt.
+
+```bash
+terraform apply
+```
+
+```bash
+yes
+```
+
+## Cleanup
+
+Run the following to remove the resources Terraform provisioned:
+
+```bash
+terraform destroy
+```
+```bash
+yes
+```