Feature Request: expose pack config to rules/triggers

[ytjohn]

Today, I wanted to add an IntervalTimer trigger, and I wanted to have the delta set in configuration.

I think it would be advantageous to allow end-users of my pack to set the interval delta (and unit) in configuration instead of having to edit the pack's yaml file.

trigger:
  type: "core.st2.IntervalTimer"
  parameters:
    unit: "{{config_context.rule1_unit}}"
    delta: {{config_context.rule1_delta}

related to #3183

[lakshmi-kannan]

@ytjohn Can you pull latest st2 unstable and test this out?

[i-cooltea]

I also hope to have this feature

[rush-skills]

I like this feature too, otherwise makes me fetch configs for the rules/triggers from k/v store