Please add some popular extensions to the PHP Docker image

[zerodeux]

Those are wildly used, and use few and light deps, they should be mandatory (eg. for proper session support) :

• php-redis (or phpX.Y-redis for Sury repo)
• php-memcached (or phpX.Y-memcached for Sury repo)
• php-intl (or phpX.Y-intl for Sury repo)

Those are very popular but drag more deps and thus will quickly make the container image much more fat and security sensitive (will be subject to much more security updates) - I would not encourage to add them but I'd like to mention them (80% of Bearstech's clients ask for them) :

• php-curl
• php-imagick