chore: refactor to atmosphere_ingress_class_name

This commit refactors to using atmosphere_ingress_class_name
and also moving it to "atmosphere" ingress class name.
diff --git a/roles/atmosphere/vars/main.yml b/roles/atmosphere/vars/main.yml
index 85f1809..f839fa4 100644
--- a/roles/atmosphere/vars/main.yml
+++ b/roles/atmosphere/vars/main.yml
@@ -1,5 +1,5 @@
 _atmosphere_cloud_spec:
   imageRepository: "{{ atmosphere_image_repository | default(None) }}"
-  ingressClassName: "{{ openstack_helm_ingress_class_name | default('openstack') }}"
+  ingressClassName: "{{ atmosphere_ingress_class_name }}"
   certManagerClusterIssuer: "{{ openstack_helm_ingress_cluster_issuer | default('atmosphere') }}"
   regionName: "{{ openstack_helm_endpoints_region_name }}"
diff --git a/roles/defaults/defaults/main.yml b/roles/defaults/defaults/main.yml
index b5a6da0..bc6551b 100644
--- a/roles/defaults/defaults/main.yml
+++ b/roles/defaults/defaults/main.yml
@@ -1,3 +1,6 @@
+# Ingress
+atmosphere_ingress_class_name: atmosphere
+
 atmosphere_images:
   alertmanager: quay.io/prometheus/alertmanager:v0.24.0
   atmosphere: quay.io/vexxhost/atmosphere:0.13.0 # x-release-please-version
diff --git a/roles/ingress_nginx/vars/main.yml b/roles/ingress_nginx/vars/main.yml
index 8370da9..6eaf0f4 100644
--- a/roles/ingress_nginx/vars/main.yml
+++ b/roles/ingress_nginx/vars/main.yml
@@ -24,8 +24,8 @@
     dnsPolicy: ClusterFirstWithHostNet
     hostNetwork: true
     ingressClassResource:
-      name: openstack
-    ingressClass: openstack
+      name: "{{ atmosphere_ingress_class_name }}"
+    ingressClass: "{{ atmosphere_ingress_class_name }}"
     kind: DaemonSet
     nodeSelector:
       openstack-control-plane: enabled
diff --git a/roles/openstack_helm_ingress/defaults/main.yml b/roles/openstack_helm_ingress/defaults/main.yml
index 9dacdb1..1a6e7b2 100644
--- a/roles/openstack_helm_ingress/defaults/main.yml
+++ b/roles/openstack_helm_ingress/defaults/main.yml
@@ -11,7 +11,7 @@
 openstack_helm_ingress_cluster_issuer: atmosphere
 
 # Name of the Ingress class to use for exposing the service.
-openstack_helm_ingress_class_name: openstack
+openstack_helm_ingress_class_name: "{{ atmosphere_ingress_class_name }}"
 
 # Secret containing the TLS certificate to use for the Ingress, overriding this
 # value globally should allow to point towards a secret containing the custom