feat: Slack Integration

[Palanikannan1437]

What does this PR do?

This PR adds in Slack integration to pipe in survery responses into your desired Slack Channels.

Demo

Screen.Recording.2024-01-22.at.5.37.53.PM.mov

How should this be tested?

• Create a slack app via https://api.slack.com/apps
• Keep token rotation in OAuth & Permission disabled or disable it
• In OAuth & Permissions, add https://localhost:3000/api/auth/callback/slack as your redirect URL
• Get the client_id and client_secret from the Basic Information tab and configure the SLACK_CLIENT_ID and SLACK_CLIENT_SECRET in your .env file
• Head over to the Formbricks main web app and go to the integrations page
• Click on the "Connect" button and complete the OAuth flow for slack after which you should be able to map channels to your surveys after a successful auth flow.

Appreciated

• Updated the Formbricks Docs if changes were necessary --> TODO

[vercel]

@Palanikannan1437 is attempting to deploy a commit to the formbricks Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@gupta-piyush19 Thanks for making this PR ready 😊💪 I still found a few things in the code that needs a change and a few smaller issues with the functionality:

[gupta-piyush19]

Thanks for the review, @mattinannt 🚀
I see a lot of minor changes related to the code consistency. I overlook most of the changes in the first review as they are similar to the other integrations, which raises the need to refactor the other integrations as well. Let's pick it up in some other ticket; I've fixed it for Slack now.

[mattinannt]

@gupta-piyush19 for the kamal setup we also now need the environment variables in these files:

• .github/workflows/kamal-setup.yml
• .github/workflows/kamal-deploy.yml
• kamal/deploy.yml
  Can you please add the Slack environment variables here? :-)

[gupta-piyush19]

Thanks, @mattinannt, for the review.
I've added the env for kamal setup. Can you please re-review the PR?

[mattinannt]

@Palanikannan1437 @gupta-piyush19 Thanks for your great job! Works great and is ready to be merged! 🚀💪

[gupta-piyush19]

Thanks, @Palanikannan1437 for the PR and @mattinannt for the review(s). 🙌

[briannezhad]

This doesn't show up for us in self-hosted. We are using https:// and have set up the variables. version v1.6.1. I follow documentation on website: https://formbricks.com/docs/integrations/slack#setup-in-self-hosted-formbricks

[gupta-piyush19]

@briannezhad Slack integration is yet to be released for self-hosted users in the upcoming release (in a few days). It is currently available for cloud users. We updated the documentation, which caused the confusion. Apologise for the inconvenience. You'll be notified once it's released.

[briannezhad]

Thank you. 🙏