6.3.0

New Features

• Add checkout_release_branch command [#223]
• Export $A8C_CI_TOOLKIT_PLUGIN_DIR, so steps running in a container can mount the plugin and use its commands [#224]

Bug Fixes

• install_a8c-secrets_binary now retries a failed download instead of giving up on the first one, so a transient hiccup on the GitHub releases CDN no longer fails the job. [#220]

Internal Changes

• Add a CI integration test that runs install_a8c-secrets_binary on real Linux and macOS agents and checks the installed binary runs. [#220]
• Bump the Xcode image used by this repo's own CI from xcode-15.4 to xcode-26.6, and introduce .buildkite/shared-pipeline-vars so that version is now defined in a single place. [#222]
• Update Ruby to 3.4.9 in .ruby-version and bundler to 4.0.18 in Gemfile.lock [#228]