test: add unit tests for custom clusterDomain in database connection strings

Verify that PostgreSQL and PostgreSQL-HA service hostnames correctly
use a custom `clusterDomain` value instead of the default
`cluster.local` when connecting to the database.

unittests/helm/dependency-checks/customization-integrity-postgresql-ha.yaml

@@ -112,6 +112,15 @@ tests:
         matchRegex:
           path: stringData.database
           pattern: HOST=gitea-unittests-postgresql-ha-pgpool.testing.svc.cluster.local:1234
+  - it: "[gitea] connects to pgpool service with custom cluster domain"
+    set:
+      clusterDomain: my-special-cluster.local
+    template: templates/gitea/config.yaml
+    asserts:
+      - documentIndex: 0
+        matchRegex:
+          path: stringData.database
+          pattern: HOST=gitea-unittests-postgresql-ha-pgpool.testing.svc.my-special-cluster.local:1234
   - it: "[gitea] connects to configured database"
     template: templates/gitea/config.yaml
     asserts:

unittests/helm/dependency-checks/customization-integrity-postgresql.yaml

@@ -71,6 +71,15 @@ tests:
         matchRegex:
           path: stringData.database
           pattern: HOST=gitea-unittests-postgresql.testing.svc.cluster.local:1234
+  - it: "[gitea] connects to postgresql service with custom cluster domain"
+    set:
+      clusterDomain: my-special-cluster.local
+    template: templates/gitea/config.yaml
+    asserts:
+      - documentIndex: 0
+        matchRegex:
+          path: stringData.database
+          pattern: HOST=gitea-unittests-postgresql.testing.svc.my-special-cluster.local:1234
   - it: "[gitea] connects to configured database"
     template: templates/gitea/config.yaml
     asserts: