Added docker files

.env

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+SUBNET=172.16.28
+EXPOSE_APACHE_WEB_SERVER_ON_PORT=8787
+EXPOSE_APACHE_WEB_SERVER_ONLY_ON_IP_ADDRESS_COLON=
+EXPOSE_MARIADB_ON_PORT=3386
+MARIADB_ROOT_PASSWORD=qwerty
+MARIADB_USERNAME=root
+MARIADB_PASSWORD=qwerty
+MARIADB_HOSTNAME=mariadb
+MARIADB_PORT=3306
+MARIADB_DATABASE_NAME=captcheck

docker-compose.yml

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+version: "3.6"
+
+services:
+  web: 
+    build: ./docker-web
+    restart: always
+    ports:
+      - ${EXPOSE_APACHE_WEB_SERVER_ONLY_ON_IP_ADDRESS_COLON}${EXPOSE_APACHE_WEB_SERVER_ON_PORT}:80
+    volumes:
+      -   .:/var/www/html
+    environment:
+      MARIADB_USERNAME: ${MARIADB_USERNAME}
+      MARIADB_PASSWORD: ${MARIADB_PASSWORD}
+      MARIADB_HOSTNAME: ${MARIADB_HOSTNAME}
+      MARIADB_PORT: ${MARIADB_PORT}
+      MARIADB_DATABASE_NAME: ${MARIADB_DATABASE_NAME}
+
+  mariadb:
+    image: mariadb:10.4
+    restart: always
+    volumes: 
+      -   ./data:/var/lib/mysql
+    environment: 
+      MYSQL_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+    ports:
+      - 127.0.0.1:${EXPOSE_MARIADB_ON_PORT}:${MARIADB_PORT}

docker-web/Dockerfile

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+FROM php:7.2-apache
+
+RUN docker-php-ext-install mysqli pdo pdo_mysql
+RUN docker-php-ext-enable mysqli
+
+RUN a2enmod rewrite
+
+RUN apt-get update && apt-get install -y zlib1g-dev libpng-dev libfreetype6-dev
+
+RUN docker-php-ext-configure gd --with-gd --with-zlib-dir --with-png-dir --with-freetype-dir
+
+RUN docker-php-ext-install gd
+