Add dependencies between actions

- [Narrator] When we edit an action as a text file, … we can use the needs attribute to show … that it depends on another action. … By adding the needs attribute, we can establish … an order for invoking the actions in the workflow. … If an action has a dependency on one action, … we can enter it as a string. … If an action has a dependency on multiple actions, … we need to enter them as a list. … If one action needs another action, in our case for example, … the second action needs the first action, … then the first action must complete successfully … before the second action is invoked. … If an action that is being depended on fails, … then the entire workflow will stop running … and be marked as failed. … Let's go back to the visual editor … and see how our workflow changes … when we add a needs attribute … to the second action in our demo. … Okay, this is how we left our workflow when we last saw it … with both actions being invoked at the same time. … Now, let's make the second action need the first action. …