[Feature request] Option to run all steps sequentially

[fishnux]

Feature request: Option to run all steps sequentially

Some of my workflows make use of steps that run sequentially, so it would be better to have an option per-DAG to run all steps sequentially. This would facilitate things such as re-ordering steps as we don't have to change the depends property, but just move steps around 🙂

[rafiramadhana]

@fishnux sounds interesting, btw may I know how do we (as a user) define the sequence?