User public tickets

[Mte90]

Ref: #323

As recap:

• A new option HELPDESK_USERS_TICKETS_PUBLIC, maybe a better name? HELPDESK_GUEST_TICKETS_PUBLIC
• Send an email to the guest users with a link to access the ticket, with a parameter with a random hash to let the access as readonly/readwrite?
• Define if the REST API will require support for that

[timthelion]

I'm a bit confused about the second point as I implemented secret ticket hashes 4 years ago and you're either the second or third person who's asked for them since then. c1750a7

Isn't this already the default behavior?

[Mte90]

I didn't know of secret hash, so if they are already available we can close the PR and implement something to send them to guest users?
I was just trying to define what to do with #323

[IvanovIvan1900]

• Send an email to the guest users with a link to access the ticket, with a parameter with a random hash to let the access as readonly/readwrite?

How should changing the ticket work?

1. By the link from the letter we get to the form where we can immediately edit the ticket
2. By the link from the letter, we get to the form where the ticket is only available for viewing and adding comments (just as it is implemented now), but there is a "Edit" button that allows you to edit the ticket by redirecting to the corresponding form