Add configuration files for Ghost, MariaDB, Nextcloud, Postgres, and Redis; implement generate-config script and enhance load-env script for dependency management

apps/ghost/config/example.env

@@ -0,0 +1,13 @@
+GHOST_NAMESPACE=ghost
+GHOST_HOST=blog.${DOMAIN}
+GHOST_TITLE="My Blog"
+GHOST_EMAIL=
+GHOST_STORAGE_SIZE=10Gi
+GHOST_MARIADB_STORAGE_SIZE=8Gi
+GHOST_DATABASE_HOST=mariadb.mariadb.svc.cluster.local
+GHOST_DATABASE_USER=ghost
+GHOST_DATABASE_NAME=ghost
+
+# Secrets
+GHOST_PASSWORD=
+GHOST_DATABASE_PASSWORD=