feat: Add azure devops var group module (#400)

* Add azure devops var group module

* Add variables description

Author: helayoty

infra/modules/providers/devops/.gitignore

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+.terraform

infra/modules/providers/devops/variable-group/.env.template

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+export AZDO_PERSONAL_ACCESS_TOKEN=
+export AZDO_ORG_SERVICE_URL=

infra/modules/providers/devops/variable-group/main.tf

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+data "azuredevops_project" "project" {
+  project_name = var.project_name
+}
+
+resource "azuredevops_variable_group" "variablegroup" {
+  project_id   = data.azuredevops_project.project.id
+  name         = var.variable_group_name
+  description  = var.variable_group_description
+  allow_access = var.allow_access
+
+  dynamic "variable" {
+    for_each = var.variables
+    content {
+      name      = variable.value.name
+      value     = variable.value.value
+      is_secret = variable.value.is_secret
+    }
+  }
+}

infra/modules/providers/devops/variable-group/output.tf

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+output "id" {
+  value = azuredevops_project.project.id
+}

infra/modules/providers/devops/variable-group/terraform.tfvars.template

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+project_name        = ""
+variable_group_name = "test terraform"
+variables = [{
+  name      = "anyname"
+  value     = "any value"
+  is_secret = false
+}]

infra/modules/providers/devops/variable-group/variables.tf

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+variable "project_name" {
+  type        = string
+  description = "Azure DevOps project name that will be used to add the new variable group"
+}
+
+variable "variable_group_name" {
+  type        = string
+  description = "Azure DevOps Variable Group Name to be created"
+}
+
+
+variable "variable_group_description" {
+  type        = string
+  description = ""
+  default     = "An optional field to add description about the variable group"
+}
+
+variable "allow_access" {
+  type        = bool
+  description = "A flag to detirmine if the variable group will allow to access all pipelines or not"
+  default     = true
+}
+
+variable "variables" {
+  type = list(object({
+    name      = string
+    value     = string
+    is_secret = bool
+  }))
+}
+

infra/modules/providers/devops/variable-group/version.tf

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+provider "azuredevops" {
+  version = ">= 0.0.1"
+}