fix: make prometheus image variable dynamic

Author: cbid71

modules/v2/main.tf

@@ -58,7 +58,7 @@ locals {
   )
   prometheus_sidecar_container = [{
     container_name  = "collector"
-    container_image = "us-docker.pkg.dev/cloud-ops-agents-artifacts/cloud-run-gmp-sidecar/cloud-run-gmp-sidecar:1.1.1"
+    container_image = var.prometheus_sidecar_image
     # Set default values for the sidecar container
     ports                = {}
     working_dir          = null

modules/v2/variables.tf

@@ -189,6 +189,12 @@ variable "enable_prometheus_sidecar" {
   default     = false
 }
 
+variable "prometheus_sidecar_image" {
+  type        = string
+  description = "Image associated to the Prometheus sidecar."
+  default     = "us-docker.pkg.dev/cloud-ops-agents-artifacts/cloud-run-gmp-sidecar/cloud-run-gmp-sidecar:1.1.1"
+}
+
 variable "volumes" {
   type = list(object({
     name = string