Adds configurable retry mechanism with basic exponential backoff to handle intermittent failures when authenticating to container registries, particularly GCP (GAR/GCR) where I'm seeing errors intermittently.
- Add retry-attempts input (default: 0 for backward compatibility, making it opt in)
- Add retry-delay input (default: 5000ms)
- Implement exponential backoff retry logic in docker login
- Chose to just write a simple retry function vs. going with a library
- Retry all errors except 5xxs
- I'm seeing intermittent 401 failures
- Add tests for retry behavior
- Update README with new input parameters
Signed-off-by: Naush Korai <naush.korai@mixpanel.com>
