Modifies ADO script to include new variable

Ensure KUBE_INGRESS_BASE_DOMAIN existence by setting his value to
AUTO_DEVOPS_DOMAIN if the first one doesnt exists. Also made
corresponding changes throughout the whole script

Related to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24580

lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml

@@ -21,8 +21,8 @@
 #
 # In order to deploy, you must have a Kubernetes cluster configured either
 # via a project integration, or via group/project variables.
-# AUTO_DEVOPS_DOMAIN must also be set as a variable at the group or project
-# level, or manually added below.
+# KUBE_INGRESS_BASE_DOMAIN must also be set on the cluster settings,
+# as a variable at the group or project level, or manually added below.
 #
 # Continuous deployment to production is enabled by default.
 # If you want to deploy to staging first, set STAGING_ENABLED environment variable.
@@ -41,8 +41,8 @@
 image: alpine:latest
 
 variables:
-  # AUTO_DEVOPS_DOMAIN is the application deployment domain and should be set as a variable at the group or project level.
-  # AUTO_DEVOPS_DOMAIN: domain.example.com
+  # KUBE_INGRESS_BASE_DOMAIN is the application deployment domain and should be set as a variable at the group or project level.
+  # KUBE_INGRESS_BASE_DOMAIN: domain.example.com
 
   POSTGRES_USER: user
   POSTGRES_PASSWORD: testing-password
@@ -251,7 +251,7 @@ review:
     - persist_environment_url
   environment:
     name: review/$CI_COMMIT_REF_NAME
-    url: http://$CI_PROJECT_PATH_SLUG-$CI_ENVIRONMENT_SLUG.$AUTO_DEVOPS_DOMAIN
+    url: http://$CI_PROJECT_PATH_SLUG-$CI_ENVIRONMENT_SLUG.$KUBE_INGRESS_BASE_DOMAIN
     on_stop: stop_review
   artifacts:
     paths: [environment_url.txt]
@@ -306,7 +306,7 @@ staging:
     - deploy
   environment:
     name: staging
-    url: http://$CI_PROJECT_PATH_SLUG-staging.$AUTO_DEVOPS_DOMAIN
+    url: http://$CI_PROJECT_PATH_SLUG-staging.$KUBE_INGRESS_BASE_DOMAIN
   only:
     refs:
       - master
@@ -330,7 +330,7 @@ canary:
     - deploy canary
   environment:
     name: production
-    url: http://$CI_PROJECT_PATH_SLUG.$AUTO_DEVOPS_DOMAIN
+    url: http://$CI_PROJECT_PATH_SLUG.$KUBE_INGRESS_BASE_DOMAIN
   when: manual
   only:
     refs:
@@ -354,7 +354,7 @@ canary:
     - persist_environment_url
   environment:
     name: production
-    url: http://$CI_PROJECT_PATH_SLUG.$AUTO_DEVOPS_DOMAIN
+    url: http://$CI_PROJECT_PATH_SLUG.$KUBE_INGRESS_BASE_DOMAIN
   artifacts:
     paths: [environment_url.txt]
 
@@ -403,7 +403,7 @@ production_manual:
     - persist_environment_url
   environment:
     name: production
-    url: http://$CI_PROJECT_PATH_SLUG.$AUTO_DEVOPS_DOMAIN
+    url: http://$CI_PROJECT_PATH_SLUG.$KUBE_INGRESS_BASE_DOMAIN
   artifacts:
     paths: [environment_url.txt]
 
@@ -823,11 +823,24 @@ rollout 100%:
     kubectl describe namespace "$KUBE_NAMESPACE" || kubectl create namespace "$KUBE_NAMESPACE"
   }
 
+
+  # Function to ensure backwards compatibility with AUTO_DEVOPS_DOMAIN
+  function ensure_kube_ingress_base_domain() {
+    if [ -z ${KUBE_INGRESS_BASE_DOMAIN+x} ]; then
+    export KUBE_INGRESS_BASE_DOMAIN=$AUTO_DEVOPS_DOMAIN
+    fi
+  }
+
   function check_kube_domain() {
-    if [ -z ${AUTO_DEVOPS_DOMAIN+x} ]; then
-      echo "In order to deploy or use Review Apps, AUTO_DEVOPS_DOMAIN variable must be set"
-      echo "You can do it in Auto DevOps project settings or defining a variable at group or project level"
+    ensure_kube_ingress_base_domain
+
+    if [ -z ${KUBE_INGRESS_BASE_DOMAIN+x} ]; then
+      echo "In order to deploy or use Review Apps,"
+      echo "AUTO_DEVOPS_DOMAIN or KUBE_INGRESS_BASE_DOMAIN variables must be set"
+      echo "From 11.8, you can set KUBE_INGRESS_BASE_DOMAIN in cluster settings"
+      echo "or by defining a variable at group or project level."
       echo "You can also manually add it in .gitlab-ci.yml"
+      echo "AUTO_DEVOPS_DOMAIN support will be dropped on 12.0"
       false
     else
       true