slack-moderator-words: Add feature to join to the public channels

[cpanato]

First of all, I want to apologize for the wrong assumptions I made, and when I did the initial implementation, I added a user token for my tests, and that works out of the box :( After some investigation realize we need to add the bot in the channels, we want to moderate.

Issue:

There is no scope/event that makes the bot receive notifications for all public channels that the bot is not part of. If we want to receive events from a public channel, the bot needs to be part of the specific channel.

Options:

1. Add the bot manually for all public channels and add that for the new channels that will be created
2. Add some automation to make the bot self-aware of public channels

Proposed solution:

When the app/bot starts, it lists all public channels and adds itself to those channels. When a new channel is created, the bot will receive a notification and add itself to the new channel.

Possible future work:

• Add a channel filter to the bot, skip those channels, and not join

Demo:

https://share.getcloudapp.com/jkuL7rr1

/kind feature /kind bug

/assign @nikhita @jeefy @mrbobbytables @ameukam

[nikhita]

I don't know much about slack code, so will defer to @jeefy

/cc @palnabarun since you've worked with the slack API before

[nikhita]

First of all, I want to apologize for the wrong assumptions I made, and when I did the initial implementation, I added a user token for my tests, and that works out of the box :(

and omg no need for apologies!! :heart:

[jeefy]

All good!

/approve

I've updated the permissions for the bot token as well. :)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, jeefy

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[nikhita]

/lgtm