Docker registry was getting overwhelmed with concurrent pushes of multiple tags and cache layers, resulting in 499 status code (Client Closed Request). Changes: - Build with --load instead of --push to save image locally first - Push each tag sequentially (latest, timestamp, git-sha) instead of all at once - Reduce cache targets from 2 to 1 (keep only buildcache) - Add progress logging for each push operation This approach: 1. Reduces concurrent write pressure on registry 2. Allows better error handling per tag 3. Provides clearer progress feedback 4. Prevents registry timeouts from concurrent uploads Related to: Status 499 error during docker push
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