Add S3 upload retry with exponential backoff

[aynaash]

Summary

Individual S3 asset uploads can fail silently — the current code logs a warning but continues. Failed uploads should be retried with exponential backoff.

Current Behavior

In aws_s3.go, upload failures are logged as warnings:

shared.SharedLogger.Warn("Failed to upload %s: %v", key, err)

Expected Behavior

• Retry failed uploads up to 3 times
• Use exponential backoff: 1s → 2s → 4s
• After 3 failures, return an error (not just a warning)
• Log retry attempts: "Retrying upload for %s (attempt %d/3)"

Files to Modify

• cli/internal/serverless/aws_s3.go — Wrap the PutObject call in a retry loop

Difficulty: Easy · Language: Go