Ajouter la configuration posthog pour vérifier la charge en production

[NicolasBuquet]

Fix #1135

Les events iOS Prod remontent bien jusqu'à PostHog :

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
14813093	Triggered	Generic High Entropy Secret	d194d33	Tchap/Config/BuildSettings.swift	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Revoke and rotate the secret.

2. If possible, rewrite git history with git commit --amend and git push --force.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[yostyle]

SGTM