fix Since symfony/dotenv 5.1: Passing a boolean to the constructor of "Symfony\Component\Dotenv\Dotenv" is deprecated, use "Dotenv::usePutenv()"

Bumps [symfony/http-kernel](https://github.com/symfony/http-kernel) from 5.1.3 to 5.1.5.
- [Release notes](https://github.com/symfony/http-kernel/releases)
- [Changelog](https://github.com/symfony/http-kernel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/http-kernel/compare/v5.1.3...v5.1.5

)

Signed-off-by: dependabot[bot] <support@github.com>

Q | A
-- | --
Bug fix? | no
New feature? | yes
BC breaks? | no
Deprecations? | no
Tickets |  
License | MIT
Doc PR |  

This adds opcache preload config for the prod php.ini as described here: https://symfony.com/doc/current/performance.html

There is no /bin/bash in the image, use /bin/sh

* - Add initContainer for DB migration

* Use same image definition

* Improve Helm chart and upgrade to v3

* Dynamic name resolution for the PHP pod

* IfNotPresent -> Always

* Various fixes and improvements

* Add readiness and liveness probe for PHP

* Tiny improvements

* Bump deps. Upgrade to the latest version of Create React App.

* Update client index

* Update wording

GitHub Packages requires auth even for pulling, so it's not ideal for a public registry.

Co-authored-by: Teoh Han Hui <teohhanhui@gmail.com>

I got an `Unauthorized error` and figured out I didn't set the Mercure JWT key. I propose to add the key to `values.yaml` so it will be less easy to miss.