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Add retry logic for transient login failures

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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>
This commit is contained in:
Naush Korai 2026-01-30 13:32:24 -05:00
parent 3227f5311c
commit 47690b2d19
7 changed files with 201 additions and 32 deletions
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README.md
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@ -618,15 +618,17 @@ credentials, while authenticated access is used only to push `myorg/myimage`.
The following inputs can be used as `step.with` keys:
| Name | Type | Default | Description |
|-----------------|--------|-------------|-------------------------------------------------------------------------------|
| `registry` | String | `docker.io` | Server address of Docker registry. If not set then will default to Docker Hub |
| `username` | String | | Username for authenticating to the Docker registry |
| `password` | String | | Password or personal access token for authenticating the Docker registry |
| `scope` | String | | Scope for the authentication token |
| `ecr` | String | `auto` | Specifies whether the given registry is ECR (`auto`, `true` or `false`) |
| `logout` | Bool | `true` | Log out from the Docker registry at the end of a job |
| `registry-auth` | YAML | | Raw authentication to registries, defined as YAML objects |
| Name | Type | Default | Description |
|------------------|--------|-------------|-------------------------------------------------------------------------------|
| `registry` | String | `docker.io` | Server address of Docker registry. If not set then will default to Docker Hub |
| `username` | String | | Username for authenticating to the Docker registry |
| `password` | String | | Password or personal access token for authenticating the Docker registry |
| `scope` | String | | Scope for the authentication token |
| `ecr` | String | `auto` | Specifies whether the given registry is ECR (`auto`, `true` or `false`) |
| `logout` | Bool | `true` | Log out from the Docker registry at the end of a job |
| `registry-auth` | YAML | | Raw authentication to registries, defined as YAML objects |
| `retry-attempts` | Number | `0` | Number of retry attempts for transient failures |
| `retry-delay` | Number | `5000` | Delay between retries in milliseconds (uses exponential backoff) |
> [!NOTE]
> The `registry-auth` input cannot be used with other inputs except `logout`.