fix(cli): keep docker login output out of build failure logs

Login output was collected into the shared build log buffer, so any build
failure printed docker's unencrypted-credentials warning amid the error
output. Scope it to the login step, surfaced only when the login itself
fails.

Author: myftija

.changeset/dry-mirrors-shake.md

@@ -0,0 +1,5 @@
+---
+"trigger.dev": patch
+---
+
+Build failure logs no longer include docker's credential-storage warning from the registry login step.

packages/cli-v3/src/deploy/buildImage.ts

@@ -514,16 +514,20 @@ async function localBuildImage(options: SelfHostedBuildImageOptions): Promise<Bu
     loginProcess.process?.stdin?.write(credentials.password);
     loginProcess.process?.stdin?.end();
 
+    // Kept out of `errors` so login noise (e.g. docker's unencrypted-credentials
+    // warning) doesn't surface in build failure logs.
+    const loginLogs: string[] = [];
+
     for await (const line of loginProcess) {
-      errors.push(line);
+      loginLogs.push(line);
       logger.debug(line);
     }
 
     if (loginProcess.exitCode !== 0) {
       return {
         ok: false as const,
         error: `Failed to login to registry: ${cloudRegistryHost}`,
-        logs: extractLogs(errors),
+        logs: extractLogs(loginLogs),
       };
     }