Add a shared dashboard module (#261)

We would like to setup a dashboard on the Azure
portal for our different environments on the
Invite team.

This would allow repos to pass in a template file
as the dashboard_properties, e.g:

```
  dashboard_properties = templatefile("dashboard-template.tpl",
      {
        environment = var.environment
        sub_id      = var.hub_subscription_id
      }
    )
```

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/portal_dashboard

Author: Harriethw

infrastructure/modules/dashboard/README.md

@@ -0,0 +1,4 @@
+# app-insights
+
+## Terraform documentation
+For the list of inputs, outputs, resources... check the [terraform module documentation](tfdocs.md).

infrastructure/modules/dashboard/main.tf

@@ -0,0 +1,9 @@
+resource "azurerm_portal_dashboard" "dashboard" {
+
+  name                = var.name
+  location            = var.location
+  resource_group_name = var.resource_group_name
+  tags                = var.tags
+
+  dashboard_properties = var.dashboard_properties
+}

infrastructure/modules/dashboard/tfdocs.md

@@ -0,0 +1,50 @@
+# Module documentation
+
+## Required Inputs
+
+The following input variables are required:
+
+### <a name="input_location"></a> [location](#input\_location)
+
+Description: The location/region where the dashboard is created.
+
+Type: `string`
+
+### <a name="input_name"></a> [name](#input\_name)
+
+Description: Is the dashboard workspace name.
+
+Type: `string`
+
+### <a name="input_resource_group_name"></a> [resource\_group\_name](#input\_resource\_group\_name)
+
+Description: The name of the resource group in which the Dashboard is created. Changing this forces a new resource to be created.
+
+Type: `string`
+
+## Optional Inputs
+
+The following input variables are optional (have default values):
+
+### <a name="input_dashboard_properties"></a> [dashboard\_properties](#input\_dashboard\_properties)
+
+Description: JSON data representing dashboard body. See above for details on how to obtain this from the Portal.
+
+Type: `string`
+
+Default: `{}`
+
+### <a name="input_tags"></a> [tags](#input\_tags)
+
+Description: A mapping of tags to assign to the resource.
+
+Type: `map(string)`
+
+Default: `{}`
+
+
+## Resources
+
+The following resources are used by this module:
+
+- [azurerm_portal_dashboard.dashboard](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/portal_dashboard) (resource)

infrastructure/modules/dashboard/variables.tf

@@ -0,0 +1,30 @@
+variable "location" {
+  type        = string
+  description = "The location/region where the dashboard is created."
+}
+
+variable "name" {
+  description = "Is the dashboard workspace name."
+  type        = string
+  validation {
+    condition     = can(regex("^[a-zA-Z0-9][a-zA-Z0-9-_]{0,253}[a-zA-Z0-9]$", var.name))
+    error_message = "The Dashboard name must be between 1 and 255 characters, start and end with an alphanumeric character, and can contain alphanumeric characters, hyphens, periods, and underscores (but not at the start or end)."
+  }
+}
+
+variable "resource_group_name" {
+  type        = string
+  description = "The name of the resource group in which the Dashboard is created. Changing this forces a new resource to be created."
+}
+
+variable "tags" {
+  type        = map(string)
+  default     = {}
+  description = "A mapping of tags to assign to the resource."
+}
+
+variable "dashboard_properties" {
+  type = string
+  default = {}
+  description = "JSON data representing dashboard body. See above for details on how to obtain this from the Portal."
+}

infrastructure/modules/shared-config/output.tf

@@ -64,6 +64,7 @@ locals {
     container-app-environment           = lower("CAE-${var.env}-${var.location_map[var.location]}-${var.application}")
     connection                          = lower("CON-${var.env}-${var.location_map[var.location]}-${var.application}")
     custom-image                        = lower("IMAGE-${var.env}-${var.location_map[var.location]}")
+    dashboard                           = lower("DASH-${var.env}-${var.location_map[var.location]}-${var.application}")
     dev-center                          = lower("DEVC-${var.env}-${var.location_map[var.location]}")
     dev-center-project                  = lower("prj-${var.env}-${var.location_map[var.location]}")
     dns-zone                            = lower("${var.application}.${var.env}.net")