set explisit backend version (#1415)

Author: tjololo

infrastructure/adminservices-test/altinn-apim-test-rg/backend.tf

@@ -48,7 +48,7 @@ resource "azurerm_container_app" "container_app" {
   template {
     container {
       name   = "dis-demo-pgsql"
-      image  = "${data.azurerm_container_registry.altinncr.login_server}/dis-hackaton/dis-demo-pgsql:latest"
+      image  = "${data.azurerm_container_registry.altinncr.login_server}/dis-hackaton/dis-demo-pgsql:0.0.1"
       cpu    = "0.5"
       memory = "1Gi"
       args = [
@@ -99,4 +99,4 @@ resource "azurerm_role_assignment" "altinncr_acrpull" {
   role_definition_name             = "AcrPull"
   scope                            = data.azurerm_container_registry.altinncr.id
   skip_service_principal_aad_check = true
-}
+}