Variables: Enable Parameters to be deployed with variables as default input type

[trahloff]

First check

• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar request and didn't find it.
• [X] I searched the Prefect documentation for this feature.

Prefect Version

2.x

Describe the current behavior

When you trigger a Flow Run from a Flow Deployment, you need to click the meatballs menu button and click "Select variable" to get the drop-down menu to select variables:

Describe the proposed behavior

Users have the option to specify the default input type for Flow parameters either in Flow code or at deployment time.

Example Use

Enforce picking a variable as the value for a specific parameter

Additional context

Stretch-goal: Give users the option to restrict the possible variables the user can pick based on a tag.

[trahloff]

@zhen0, sorry, I think I mistakenly left "3.x" from the issue template as the Prefect version when creating the ticket. Ideally, this would also be supported in v2.x

[serinamarie]

Hi @trahloff, thanks for the issue! We've added this to our backlog for 2. x and 3.x