adds standalone docker image for third party applications

Dockerfile.standalone

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+FROM php:7.4-apache
+MAINTAINER "Iordanis Kostelidis <ikostelidis@datascouting.com>"
+
+ARG APP_UID=1000
+ARG APP_GID=1000
+
+ARG TIMEZONE=Europe/Athens
+
+ENV LC_ALL=en_US.UTF-8
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US.UTF-8
+
+ENV DEBIAN_FRONTEND=noninteractive
+ARG PHP_INI_PROFILE=production
+
+# Update the base image, set timezone and locales
+RUN apt-get update && apt-get upgrade -y \
+ && apt-get -y install apt-utils \
+ && apt-get -y install tzdata \
+ && ln -fs /usr/share/zoneinfo/${TIMEZONE} /etc/localtime \
+ && dpkg-reconfigure --frontend noninteractive tzdata \
+ && apt-get install -y locales locales-all
+
+# Install libcap (we need it to allow apache bind 80 port without root)
+RUN apt-get -y install libcap2 libcap2-bin
+
+# Install application dependencies
+RUN apt-get -y install yaz xsltproc
+
+# Clean up
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Setup apache and php
+RUN setcap 'cap_net_bind_service=+ep' /usr/sbin/apache2 \
+ && a2enmod rewrite \
+ && service apache2 restart \
+ && cp /usr/local/etc/php/php.ini-${PHP_INI_PROFILE} /usr/local/etc/php/php.ini
+
+# Create application user
+RUN groupadd -g "${APP_GID}" unimarc2marc21 \
+ && useradd -u "${APP_UID}" -ms /bin/bash -g unimarc2marc21 unimarc2marc21 \
+ && usermod -a -G unimarc2marc21 www-data
+
+# Change default user
+USER unimarc2marc21
+
+COPY --chown=unimarc2marc21:www-data ./www /var/www/html