Use variables instead of hardcoded values

These variables can be changed in the API repo, while everything else is backwards compatible.

Author: Yasmine-97

google/redis/main.tf

@@ -7,18 +7,18 @@ resource "google_redis_instance" "main" {
   region  = var.region
   name    = var.name
 
-  redis_version = "REDIS_7_2"
+  redis_version = var.version
 
-  memory_size_gb = 2
+  memory_size_gb = var.memory
 
   authorized_network = var.network
   connect_mode       = "PRIVATE_SERVICE_ACCESS"
 
   auth_enabled = true
 
   persistence_config {
-    persistence_mode    = "RDB"
-    rdb_snapshot_period = "ONE_HOUR"
+    persistence_mode    = var.persistence_mode
+    rdb_snapshot_period = var.persistence_period
   }
 
   depends_on = [

google/redis/variables.tf

@@ -34,3 +34,23 @@ variable "cluster" {
 variable "network" {
   type = string
 }
+
+variable "version" {
+  type    = string
+  default = "REDIS_7_2"
+}
+
+variable "memory" {
+  type    = number
+  default = 2
+}
+
+variable "persistence_mode" {
+  type    = string
+  default = "RDB"
+}
+
+variable "persistence_period" {
+  type    = string
+  default = "ONE_HOUR"
+}