How to make PHP7 Dockerfile with intl and ICU version 55.1?

Development | Programming languages
Dockerfile is here:

FROM php: 7.0-fpm
RUN apt-get update \
    &apt-get install -y libicu55 \
    &&docker-php-ext-install -j $(nproc) intl

But in debian: jessie from which the php7 image is compiled is not libicu55.
In other words, how to install in debian jessie INTL with ICU version 55.1?
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You need to find a repository for the distribution you are using with the correct software version, and register it in /etc/apt/sources.list
Well, in the future, install the necessary package with the version.

on July 15th, 2020 (5:32 pm)
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