Drivers

Enable providers, override the output path, pin GitHub Actions, and merge raw YAML as an escape hatch.

'drivers' => [
    'github'    => ['enabled' => true, 'options' => ['permissions' => ['contents' => 'read'], 'pins' => ['actions/checkout' => '<40-char sha>']]],
    'bitbucket' => ['enabled' => true, 'options' => ['image' => 'php:{php}-cli']],
    'gitlab'    => ['enabled' => true, 'path' => '.gitlab-ci.yml', 'raw' => ['default' => ['tags' => ['docker']]]],
],

Driver	Output	Options
github	.github/workflows/slipway.yml	runner, permissions, pins
bitbucket	bitbucket-pipelines.yml	image, shell_image, bootstrap, size
gitlab	.gitlab-ci.yml	image, shell_image, bootstrap, tags

path overrides the output file. raw is deep-merged into the generated YAML as an escape hatch (maps merge; lists and scalars replace).

See Provider support for what each driver can express, and Writing a driver to add another provider.