[LiveComponent] Allow configuring secret for fingerprints and checksums

[smnandre]

Q	A
Bug fix?	no
New feature?	yes
Issues	Fix #2453
License	MIT

Allow to configure a dedicated secret (used in FingerprintCalculator and LiveComonentHydrator)

Suggested by @dkarlovi in #2453
Implementation inspired by symfony #56840

Should be merged after #2461

[Kocal]

It's an interesting approach, are there any plans to open a PR on symfony/recipes?

[smnandre]

Not at all, why?

[kbond]

Is there any considerations we need to make regarding: https://symfony.com/blog/new-in-symfony-7-2-optional-secret ?

[smnandre]

@kbond I don't think so, if i understand this correctly

With these changes, if you enable a feature that requires a secret but have not configured one, Symfony will throw an exception with a clear message explaining how to resolve the issue.

But that's one of the reasons this PR checks for empty secrets: #2461)

[Kocal]

Not at all, why?

For pure user-DX, I believe creating recipes with commented/default options is nice to have

[smnandre]

This would be the only options for the live_component package.. so i'm not sure we want to annoy existing apps with a new file for this only.. it's more a power-user to me and can lead to very bad/insecure choices :|

I guess this is something we will do easier when centralized (at least a bit) in UX Bundle

[Kocal]

Makes sense, thanks! :)