setup cron local mail reporting and longhorn recurring backup job

iac/gcs_backup.tf

@@ -1,7 +1,7 @@
 # https://longhorn.io/docs/1.9.1/snapshots-and-backups/backup-and-restore/set-backup-target/#set-up-gcp-cloud-storage-backupstore
 resource "google_storage_bucket" "longhorn_backup" {
   name          = "arcodange-backup"
-  location      = "US-EAST1"
+  location      = "NAM4" # https://cloud.google.com/storage/docs/locations#location-dr
   force_destroy = true
 
   public_access_prevention = "enforced"
@@ -17,8 +17,8 @@ resource "google_storage_bucket_iam_member" "longhorn_backup" {
   member = "serviceAccount:${google_service_account.longhorn_backup.email}"
 }
 
-resource "google_service_account_key" "longhorn_backup" {
-  service_account_id = google_service_account.longhorn_backup.account_id
+resource "google_storage_hmac_key" "longhorn_backup" {
+  service_account_email = google_service_account.longhorn_backup.email
 
 }
 
@@ -34,9 +34,11 @@ resource "vault_kv_secret_v2" "longhorn_gcs_backup" {
   name                = "longhorn/gcs-backup"
   cas                 = 1
   delete_all_versions = true
-  data_json = base64decode(
-    google_service_account_key.longhorn_backup.private_key
-  )
+  data_json = jsonencode({
+    AWS_ACCESS_KEY_ID = google_storage_hmac_key.longhorn_backup.access_id
+    AWS_SECRET_ACCESS_KEY = google_storage_hmac_key.longhorn_backup.secret
+    AWS_ENDPOINTS: "https://storage.googleapis.com"
+  })
 }
 
 data "vault_policy_document" "longhorn_gcs_backup" {