Docker PHP7 CLI Debian Buster how to install package php-imagick? - php

Question

I have a PHP-CLI Docker image of Debian Buster and would like to install php-imagick package but with command:
Dockerfile:
RUN apt-get install -y php-imagick
I get an error:
Package php-imagick is not available, but is referred to by another
package. This may mean that the package is missing, has been
obsoleted, or is only available from another source
E: Package 'php-imagick' has no installation candidate
running before:
RUN apt-get update -y && apt-get upgrade -y
did not help.
how come there is no package candidate for php-imagick?
how to install and enable imagick extension for this PHP Docker image?
Dockerfile to replicate issue:
FROM php:7.3-buster
RUN apt-get update -y && apt-get upgrade -y
RUN apt-get install -y php-imagick
build command
docker build --tag testimage .

Answer 1

Unless you have a good reason not to, using the packages from https://deb.sury.org/ is probably a good idea. The following appears to work:
FROM debian:buster-slim
USER root
# Get Debian up-to-date
RUN apt-get update -qq \
&& DEBIAN_FRONTEND=noninteractive apt-get install -y git \
mariadb-client wget curl \
ca-certificates lsb-release apt-transport-https gnupg bsdmainutils
RUN echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | tee -a /etc/apt/sources.list.d/php.list \
&& curl https://packages.sury.org/php/apt.gpg | apt-key add - \
&& apt-get update -qq \
&& DEBIAN_FRONTEND=noninteractive apt-get install -y php7.3 php7.3-common php7.3-cli \
php7.3-mysql php7.3-curl php7.3-xml php7.3-mbstring \
php7.3-intl php7.3-redis php7.3-zip \
php7.3-imagick supervisor