chore(release): 6.4.0

# [6.4.0](https://gitlab.com/just-ci/templates/compare/v6.3.2...v6.4.0) (2022-08-10)

### Features

* pipeline scheduler defaults, extendability, and adding variables ([0e720759](https://gitlab.com/just-ci/templates/commit/0e720759e1ec76bea7bebcdd6ba73b5037680c72))