We named this CRD a "schedule": It schedules workflows for now but we will add support for other K8 resources (e.g., jobs). It supports:

executing pipelines using a cron schedule
executing pipelines using a periodic interval
An optional start date and an end date.
Backfilling (by specifying a start date in the past).
A maximum number of concurrent workflows.
Most of the files are automatically generated except for the files in:

./hack/custom-boilerplate.go.txt
./hack/update-codegen.sh
./hack/verify-codegen.sh
./pkg/apis/schedule/register.go
./pkg/apis/schedule/v1alpha1/doc.go
./pkg/apis/schedule/v1alpha1/register.go
./pkg/apis/schedule/v1alpha1/types.go

…mplementation