runs-on/runs-on v3.1.0

on GitHub

Spotlight

• Introduce Fleet as a first-class RunsOn product for GitHub Actions runner scale sets, built around pool-based capacity management instead of one runner per job attempt.
• Add ECR pull-through cache support for runner image pulls, reducing dependency on upstream registry availability and improving cold-start behavior.

CloudFormation

• Disable budget-related resources when the configured daily budget is zero.
• Add an explicit dependency for the Network Firewall endpoint resolver log group to avoid creation-order failures.

Terraform

• Add Terraform support for deploying Fleet pools and their control-plane resources.
• Add reusable control-plane alerting resources for Fleet email notifications.
• Add Terraform controls for creating or referencing ECR pull-through cache rules.
• Allow S3 cache buckets to be configured as account-regional resources.
• Disable budget-related resources when the configured daily budget is zero.

Other fixes

• Include ECS server logs around the job in CLI --full diagnostics archives.
• Add Windows S3 cache support for GitHub Actions cache workflows.
• Improve runner resilience when transient GitHub registration authorization failures occur.
• Improve Fleet launch and registration observability, including clearer reporting when spot capacity is disabled.

Release resources

• Upgrade guide: https://runs-on.com/guides/upgrade/
• CloudFormation template: https://runs-on.s3.eu-west-1.amazonaws.com/cloudformation/template-v3.1.0.yaml