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

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+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=

apps/mysql/config/example.env

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+MARIADB_NAMESPACE=mariadb
+MARIADB_RELEASE_NAME=mariadb
+MARIADB_USER=app
+MARIADB_DATABASE=app_database
+MARIADB_STORAGE=8Gi
+MARIADB_TAG=11.4.5
+MARIADB_PORT=3306
+
+# Secrets
+MARIADB_PASSWORD=
+MARIADB_ROOT_PASSWORD=

apps/nextcloud/config/example.env

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+# Config
+NEXTCLOUD_ADMIN_USER=admin
+NEXTCLOUD_TRUSTED_DOMAINS=$DOMAIN
+NEXTCLOUD_DOMAIN=nextcloud.$DOMAIN
+NEXTCLOUD_STORAGE=5Gi
+NEXTCLOUD_NFS_STORAGE=100Gi
+PHP_MEMORY_LIMIT=4G
+PHP_UPLOAD_LIMIT=1G
+
+NEXTCLOUD_IMAGE=nextcloud:26
+NEXTCLOUD_DB_TYPE=postgres
+NEXTCLOUD_DB_HOST=postgres.postgres.svc.cluster.local
+NEXTCLOUD_DB_USER=nextcloud
+NEXTCLOUD_DB_NAME=nextcloud
+POSTGRES_ADMIN_USER=$POSTGRES_USER
+
+# Secrets
+NEXTCLOUD_ADMIN_PASSWORD=
+NEXTCLOUD_DB_PASSWORD=
+POSTGRES_ADMIN_PASSWORD=$POSTGRES_PASSWORD

apps/postgres/config/example.env

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+POSTGRES_DB=postgres
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=OhPostgres!
+POSTGRES_STORAGE=10Gi