DPE-5627 CC006 compliance (#737)

* tf module on charm

* default arch constraint

terraform/main.tf

@@ -0,0 +1,21 @@
+resource "juju_application" "k8s_postgresql" {
+  name  = var.app_name
+  model = var.juju_model_name
+  trust = true
+
+  charm {
+    name     = "postgresql-k8s"
+    channel  = var.channel
+    revision = var.revision
+    base     = var.base
+  }
+
+  storage_directives = {
+    pgdata = var.storage_size
+  }
+
+  units       = var.units
+  constraints = var.constraints
+  config      = var.config
+  resources   = var.resources
+}

terraform/outputs.tf

@@ -0,0 +1,20 @@
+output "application_name" {
+  value = juju_application.k8s_postgresql.name
+}
+
+
+output "provides" {
+  value = {
+    database          = "database",
+    metrics_endpoint  = "metrics-endpoint",
+    grafana_dashboard = "grafana-dashboard"
+  }
+}
+
+output "requires" {
+  value = {
+    logging       = "logging"
+    certificates  = "certificates"
+    s3_parameters = "s3-parameters"
+  }
+}

terraform/variables.tf

@@ -0,0 +1,58 @@
+variable "juju_model_name" {
+  description = "Juju model name"
+  type        = string
+}
+
+variable "app_name" {
+  description = "Name of the application in the Juju model."
+  type        = string
+  default     = "postgresql-k8s"
+}
+
+variable "channel" {
+  description = "Charm channel to use when deploying"
+  type        = string
+  default     = "14/stable"
+}
+
+variable "revision" {
+  description = "Revision number to deploy charm"
+  type        = number
+  default     = null
+}
+
+variable "base" {
+  description = "Application base"
+  type        = string
+  default     = "[email protected]"
+}
+
+variable "units" {
+  description = "Number of units to deploy"
+  type        = number
+  default     = 1
+}
+
+variable "constraints" {
+  description = "Juju constraints to apply for this application."
+  type        = string
+  default     = "arch=amd64"
+}
+
+variable "storage_size" {
+  description = "Storage size"
+  type        = string
+  default     = "10G"
+}
+
+variable "config" {
+  description = "Application configuration. Details at https://charmhub.io/postgresql-k8s/configurations"
+  type        = map(string)
+  default     = {}
+}
+
+variable "resources" {
+  description = "Resources to use with the application"
+  type        = map(string)
+  default     = {}
+}

terraform/versions.tf

@@ -0,0 +1,9 @@
+terraform {
+  required_version = ">= 1.6.6"
+  required_providers {
+    juju = {
+      source  = "juju/juju"
+      version = ">= 0.14.0"
+    }
+  }
+}