volumes: generate systemd mount files based on mount type

migrations/schema.sql

@@ -257,6 +257,8 @@ CREATE TABLE IF NOT EXISTS volumes(
     name VARCHAR(256) NOT NULL UNIQUE,
     hostPath VARCHAR(1024) NOT NULL UNIQUE,
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    mountType VARCHAR(16) DEFAULT "noop",
+    mountOptionsJson TEXT,
     PRIMARY KEY (id)
 );