closes ENG-632
- This listens to a new property in the `milestones` config to set a minimum value of Milestones we wanna use the Slack notification service for
no issue
- Reduced the amount of diffeerent properties by not populating a `currentARR` and `currentMembers` fields, but use a `currentValue` instead.
- The type of milestone can still be determined by its `type` property, so we actually don't need two different props here
refs
https://www.notion.so/ghost/Marketing-Milestone-email-campaigns-1d2c9dee3cfa4029863edb16092ad5c4?pvs=4
- Added a `slack-notifications` repository which handles sending Slack
messages to a URL as defined in our Ghost(Pro) config (also includes a
global switch to disable the feature if needed) and listens to
`MilestoneCreatedEvents`.
- Added a `slack-notification` service which listens to the events on
boot.
- In order to have access to further information such as the reason why
a Milestone email hasn't been sent, or the current ARR or Member value
as comparison to the achieved milestone, I added a `meta` object to the
`MilestoneCreatedEvent` which then gets accessible by the event
subscriber. This avoid doing further requests to the DB as we need to
have this information in relation to the event occurred.
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Co-authored-by: Fabien "egg" O'Carroll <fabien@allou.is>
