fix(prestashop): fix some bugs in image

[EdieLemoine]

• fix permissions before cache steps
• fix memory limit error when clearing and warming up cache
• display full url on start
• clean up env vars
• install cli dependencies on start
• improve installation and theme building for all ps versions

[gitguardian]

️✅ There are no secrets present in this pull request anymore.

If these secrets were true positive and are still valid, we highly recommend you to revoke them.
Once a secret has been leaked into a git repository, you should consider it compromised, even if it was deleted immediately.
Find here more information about risks.

---

^{_{🦉 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.}}