Redis extension does not work without igbinary

[ikulis]

As follow up from #213 , Kudos to #213 (comment)

Expected Behavior

Image should work by just adding redis extension without you need to add igbinary.

Current Behavior

Starting image fails:

$ docker-compose up web
Recreating redis-breaks_web_1 ... done
Attaching to redis-breaks_web_1
web_1  | PHP Warning:  PHP Startup: Unable to load dynamic library 'redis.so' (tried: /usr/lib/php/20190902/redis.so (/usr/lib/php/20190902/redis.so: undefined symbol: igbinary_serialize), /usr/lib/php/20190902/redis.so.so (/usr/lib/php/20190902/redis.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
web_1  | /usr/local/bin/docker-entrypoint-as-root.sh: line 129: supercronic: command not found
web_1  | PHP Warning:  PHP Startup: Unable to load dynamic library 'redis.so' (tried: /usr/lib/php/20190902/redis.so (/usr/lib/php/20190902/redis.so: undefined symbol: igbinary_serialize), /usr/lib/php/20190902/redis.so.so (/usr/lib/php/20190902/redis.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
web_1  | bash: line 2: syntax error near unexpected token `('
web_1  | bash: line 2: `Warning: PHP Startup: Unable to load dynamic library 'redis.so' (tried: /usr/lib/php/20190902/redis.so (/usr/lib/php/20190902/redis.so: undefined symbol: igbinary_serialize), /usr/lib/php/20190902/redis.so.so (/usr/lib/php/20190902/redis.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0'
redis-breaks_web_1 exited with code 2

Possible Solution

• Somehow autoenable igbinary extension after redis extension is enabled.
• add some disclaimer in Readme.md that igbinary extension is required

Steps to Reproduce (for bugs)

1. Make Dockerfile

# Required default PHP extensions
ARG PHP_EXTENSIONS="redis"

# Image for the development
FROM thecodingmachine/php:7.4-v3-slim-apache

2. Make docker-compose.yml

version: '3.4'

services:
  web:
    build: ./
    environment:
      TEMPLATE_PHP_INI: "development"
      PHP_INI_ERROR_REPORTING: "E_ERROR"
      PHP_EXTENSION_XDEBUG: "0"
      PHP_INI_XDEBUG__REMOTE_AUTOSTART: "0"
      TZ: "Europe/Amsterdam"
      APACHE_DOCUMENT_ROOT: "public"
    volumes:
      - "./:/var/www/html/"

3. docker-compose build
4. docker-compose up web

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