[kots]: delete channel on branch delete

[mrsimonemms]

Description

GitHub Action to delete a KOTS channel on branch deletion. This will cut down on the amount of manual work that @gitpod-io/engineering-self-hosted have to do in housekeeping in the Replicated vendor portal.

In most cases, this will actually do nothing. Most branches do not create a channel in Replicated - the only time is if a PR is run with /werft run publish-to-kots when it will publish to a channel with the same name as the branch. This Action exists to delete these channels when the branch is deleted.

If a channel has customers assigned to it, it will not delete the channel as the workflow is that channels must have zero customers before they can be deleted - that's a failsafe against customer channels such as stable or enterprise being deleted. Also, this Action can never error as the continue-on-error: true param is set.

/hold Before this is merged, a secret will need to be added to our GitHub settings.

How to test

I have built this using a noddy repo and done various tests to prove it works:

• delete channel
• no error if channel doesn't exist

Release Notes

NONE

Documentation

Werft options:

• /werft with-preview

[mrsimonemms]

/hold cancel

The secrets have been added to GitHub Actions

[Pothulapati]

LGTM, apart from that question!

/hold just on the discussion. Feel free to remove this if you don't think that's necessary. :)

[Pothulapati]

TIOLI: How about we also do the check manually? Just want to be on the safer side, as its a v important operation.

[mrsimonemms]

To the best of my knowledge, there's no way of checking if a channel has customers using the CLI. Honestly, it's all a little undocumented so I've had to dig through the source code. The closest we have is channel counts but keeps coming back with Error: This feature is not supported for Kots applications. which makes no sense.

It is documented that you cannot delete a channel with customers and there's no option to force delete. And we wouldn't habitually use branches with the channel names stable, beta, unstable, enterprise.

[Pothulapati]

Thanks for the elaborate answer. It makes sense.

[mrsimonemms]

If there's any issues, we can always get revert this commit (I'm going to create/delete a branch now)

[Pothulapati]

/unhold

[mrsimonemms]

This works:

• branch deleted, no KOTS channel, no error
• branch deletes, KOTS channel, deleted

[Pothulapati]

NICE @mrsimonemms