feat: add budget alert BB for GCP

gcp/terraform/operations/budget-alert/README.md

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+# Budget-Alert-building-block
+This building block sets up a budget on your organization for your project scope. 
+
+The following APIs need to be enabled:
+- cloud billing API
+- service usage API
+
+The service account requires the following permission on the organization level:
+- Billing Account Administrator
+
+
+## Notes:
+- Create and upload your backend.tf in input section of the building block definition in meshStack
+- add your service account JSON key containings as a string and encrypted environment variable and name it "GOOGLE_CREDENTIALS"

gcp/terraform/operations/budget-alert/main.tf

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+data "google_billing_account" "account" {
+  billing_account = var.billing_account
+}
+
+resource "google_billing_budget" "budget" {
+  billing_account = data.google_billing_account.account.id
+
+  budget_filter {
+    projects = ["projects/${var.projectid}"]
+  }
+
+  display_name = "${var.projectid}-budget"
+  amount {
+    specified_amount {
+      currency_code = "EUR"
+      units         = var.budget_amount
+    }
+  }
+  threshold_rules {
+    threshold_percent = var.alert_treshold
+  }
+}

gcp/terraform/operations/budget-alert/provider.tf

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+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "5.8.0"
+    }
+  }
+}
+
+provider "google" {
+  project               = var.projectid
+  billing_project       = var.projectid
+  user_project_override = true
+}
+

gcp/terraform/operations/budget-alert/variables.tf

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+variable "projectid" {
+  type        = string
+  description = "Id of the project you want to specify this budget alert for"
+}
+
+variable "billing_account" {
+  type        = string
+  description = "billing account id for your project's organization"
+}
+
+variable "budget_amount" {
+  type        = string
+  description = "The amount of monthly Budget specified for this project"
+}
+
+variable "alert_treshold" {
+  type        = string
+  description = "Ratio of the budget amount that you want to receive an alert when it reached. e.g. '0.5' means 50%"
+}