Docker with PHP – Class “Redis” not found

Dump extension_loaded('redis') returns true but I get

Class "Redis" not found

I have a simple docker file like

FROM php:7.1.32-fpm-alpine3.10

ENV PHPREDIS_VERSION 5.2.2

RUN docker-php-source extract && \
  curl -L -o /tmp/redis.tar.gz https://github.com/phpredis/phpredis/archive/$PHPREDIS_VERSION.tar.gz && \
  tar xfz /tmp/redis.tar.gz && \
  rm -r /tmp/redis.tar.gz && \
  mv phpredis-$PHPREDIS_VERSION /usr/src/php/ext/redis && \
  docker-php-ext-install redis

ENTRYPOINT ["php-fpm"]

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