fix: modernize docker publishing

ts/index.ts

@@ -10,13 +10,12 @@ let rendertronInstance: Rendertron;
 export const runCli = async () => {
   logger.log('info', `Starting rendertron...`);
   rendertronInstance = new Rendertron();
-  rendertronInstance.start();
+  await rendertronInstance.start();
   logger.log('success', `Successfully started rendertron!`);
 };
 
 export const stop = async () => {
   if (rendertronInstance) {
-    rendertronInstance.stop();
+    await rendertronInstance.stop();
   }
-  db.close();
 };