fix(k8s): add postgresql init scripts configmap and local storage

- Add postgresql-init-scripts ConfigMap with multiple database creation script
- Keep app-config ConfigMap for general application configuration
- Add local storage class and PostgreSQL persistent volume for single-node cluster
- Fix ConfigMap name mismatch that was preventing PostgreSQL startup

k8s/namespace/configmap.yaml

@@ -1,5 +1,36 @@
 apiVersion: v1
 kind: ConfigMap
+metadata:
+  name: postgresql-init-scripts
+  namespace: base-infrastructure
+data:
+  create-multiple-postgresql-databases.sh: |
+    #!/bin/bash
+
+    set -e
+    set -u
+
+    function create_user_and_database() {
+        local database=$1
+        echo "  Creating user and database '$database'"
+        psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+            CREATE USER $database;
+            CREATE DATABASE $database;
+            GRANT ALL PRIVILEGES ON DATABASE $database TO $database;
+    EOSQL
+    }
+
+    if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
+        echo "Multiple database creation requested: $POSTGRES_MULTIPLE_DATABASES"
+        for db in $(echo $POSTGRES_MULTIPLE_DATABASES | tr ',' ' '); do
+            create_user_and_database $db
+        done
+        echo "Multiple databases created"
+    fi
+
+---
+apiVersion: v1
+kind: ConfigMap
 metadata:
   name: app-config
   namespace: base-infrastructure
@@ -8,7 +39,4 @@ data:
   POSTGRES_PORT: "5432"
   
   # Umami Configuration  
-  UMAMI_PORT: "3000"
-  
-  # Add other non-sensitive config values as needed
-  # These correspond to your stack.env variables
+  UMAMI_PORT: "3000"