add retry to platform.start instead

this is because it holds a lock and cannot be re-tried

See also 0c0aeeae4c which tried to
make it for all startup tasks

src/cloudron.js

@@ -152,16 +152,8 @@ async function runStartupTasks() {
 
     // we used to run tasks in parallel but simultaneous nginx reloads was causing issues
     for (let i = 0; i < tasks.length; i++) {
-        for (let attempt = 0; attempt < 3; attempt++) {
-            const [error] = await safe(tasks[i]());
-            if (!error) break; // task succeeded
-            debug(`Startup task at index ${i} failed (attempt ${attempt}): ${error.message}`);
-            // for some reason, mysql arbitrary restarts making startup tasks fail. this makes the box update stuck
-            const retry = error.reason === BoxError.DATABASE_ERROR && error.code === 'PROTOCOL_CONNECTION_LOST';
-            if (!retry) break;
-            debug(`Will retry task at index ${i}`);
-            await delay(3000);
-        }
+        const [error] = await safe(tasks[i]());
+        if (error) debug(`Startup task at index ${i} failed: ${error.message}`);
     }
 }