Create Trello Powerup for copying onboarding boards

[patcon]

The copying phase is a little awkward: https://trello.com/c/KIFn3CtG/18-copy-this-trello-board (heard this from both people who used board)

Goals

• Make it simpler for users to copy board with correct settings (ie readable by others)
• Let team know when someone has started a self-led onboarding, so that they can check in and make sure things are going well.

Proposal

We could build a Trello Power-Up to create this flow:

1. User clicks custom button at top of the template board
2. popup dialog asks them to sign up/in and authorize our "Copy Board" app
3. After authorization, the button will copy their board, name it according to a pattern (<username>'s <name of board>), and set it public
4. Admin of template board (us) can config powerup to drop a message into a slack channel: <username> has started onboarding: <board link> (this might instead of a url to while a payload can be delivered, which we would then add a little hubot script to handle it)

This component could be reusable and used by others who wish to use Trello similarly. It might be fodder for a blog post down the road, if it proves successful.

cc @cswc

[patcon]

Some resources I've been learning with:

• http://tech.trello.com/power-up-tutorial-part-two/
• http://tech.trello.com/power-up-tutorial-part-three/ (adds third-party auth)
• https://gitlab.com/gitlab-org/trello-power-up/ (an example of a powerup doing third-party auth in wild)
• https://larry-price.com/blog/2014/03/18/connecting-to-the-trello-api/
• https://github.com/Droplr/trello-power-up (powerup that authenticates with trello itself, which is exactly what we want, so lots of learn from)
• https://github.com/trello/power-up-template (a template that trello suggests starting with, which works through github pages)
• https://trello.com/1/client.coffee (coffeescript source for client.js trello api code)
• https://trello.readme.io/v1.0/reference#boardsid (Trello api call used for copying boards)

Glitch is a service that Trello recommends developing power-ups with, as it's immediately available for testing, so I've got in-progress test code here: https://glitch.com/edit/#!/trello-powerup-board-copier

Place to administer custom powerups: https://trello.com/power-ups/admin (added a few on EDGI trello org for testing)

Testing on this board: https://trello.com/b/BnQNbop5/testing

[patcon]

Code for a proof-of-concept stub that's working: https://github.com/patcon/trello-powerup-board-copier/issues/9

Currently running on: https://trello.com/b/ET8wNxE9/data-together-dev-onboarding

[Frijol]

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[lightandluck]

@Frijol I'd like to get your thoughts about Trello onboarding in a chat after the holidays