Docker support for local development

docker/development/Dockerfile

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+FROM php:7.4-apache
+RUN apt update && apt install -y \
+      ssl-cert \
+      libicu-dev \
+      libjpeg-dev zlib1g-dev libpng-dev libwebp-dev
+RUN docker-php-ext-configure gd --with-jpeg --with-webp
+RUN docker-php-ext-install bcmath exif gettext gd intl mysqli
+RUN a2enmod rewrite ssl
+RUN a2ensite default-ssl

docker/development/README.md

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+# Docker for development
+
+This directory has docker related files for local development.
+
+You can run GNU social on Docker by following commands on your local machine.
+
+```
+cd /path/to/repository
+mkdir -p file/avatar
+cp DOCUMENTATION/SYSTEM_ADMINISTRATORS/webserver_conf/htaccess.sample public/.htaccess
+
+cd docker/development
+docker compose up -d
+```
+
+After commands, you can open <https://localhost/installer.php> on your web browser. If you use Chromium/Google Chrome, you need to open <chrome://flags/#allow-insecure-localhost> and turn to [Enabled] for security alert.
+
+In installer, you need to fill following database settings.
+
+- Hostname: db
+- Type: MariaDB
+- Name: gnusocial
+- DB username: root
+- DB password: (empty)
+
+You can remove container and named volume by following commands.
+
+```
+docker compose down
+docker volume rm development_gnusocial-db
+```
+

docker/development/docker-compose.yml

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+version: "3"
+services:
+  db:
+    image: mariadb:10.3
+    restart: always
+    volumes:
+      - gnusocial-db:/var/lib/mysql
+    environment:
+       MYSQL_DATABASE: gnusocial
+       MYSQL_ALLOW_EMPTY_PASSWORD: 1
+    ports:
+      - 3306:3306
+    command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_bin
+  php:
+    build: .
+    restart: always
+    volumes:
+      - ../../:/var/www/
+      - ../../public:/var/www/html
+    ports:
+      - 80:80
+      - 443:443
+    depends_on:
+      - db
+volumes:
+  gnusocial-db: