server: add Dockerfile and environment variables

The Dockerfile (and docker-compose) simplify the server's deployment.
The environment variables avoid secrets in the code.

Dockerfile

@@ -0,0 +1,8 @@
+FROM docker.io/library/php:8.3-apache
+
+COPY server/*.php /var/www/html
+COPY server/.htaccess /var/www/html
+
+RUN a2enmod rewrite && docker-php-ext-install pdo pdo_mysql
+
+EXPOSE 80

docker-compose.yml

@@ -0,0 +1,40 @@
+services:
+  db:
+    image: docker.io/library/mariadb:11.5.2
+    container_name: ${MYSQL_HOST}
+    restart: always
+    ports:
+      - 127.0.0.1:${MYSQL_PORT}:3306
+    environment:
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
+      MYSQL_DATABASE: ${MYSQL_DATABASE}
+      MYSQL_USER: ${MYSQL_USER}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
+
+  phpmyadmin:
+    image: docker.io/library/phpmyadmin
+    container_name: fecharts_phpmyadmin
+    links:
+      - ${MYSQL_HOST}
+    restart: unless-stopped
+    ports:
+      - 127.0.0.1:${PHPMYADMIN_PORT}:80
+    environment:
+      - PMA_ARBITRARY=1
+      - PMA_HOST=${MYSQL_HOST}
+      - PMA_PORT=${MYSQL_PORT}
+
+  api:
+    image: odari/fecharts_api:1.0.0
+    container_name: fecharts_api
+    links:
+      - ${MYSQL_HOST}
+    restart: always
+    ports:
+      - 127.0.0.1:${FECHARTS_API_PORT}:80
+    environment:
+      - MYSQL_HOST=${MYSQL_HOST}
+      - MYSQL_USER=${MYSQL_USER}
+      - MYSQL_PASSWORD=${MYSQL_PASSWORD}
+      - MYSQL_DATABASE=${MYSQL_DATABASE}
+      - MYSQL_PORT=${MYSQL_PORT}

server/database.php

@@ -7,20 +7,14 @@ class database
     private static $instance = null;
     private $conn;
 
-    private $host = 'localhost';
-    private $user = 'root';
-    private $pass = '';
-    private $name = 'fe_charts';
-    private $port = '';
-
     // The db connection is established in the private constructor.
     private function __construct()
     {
         try {
             $this->conn = new PDO(
-                "mysql:host={$this->host};dbname={$this->name};port={$this->port}",
-                $this->user,
-                $this->pass
+                'mysql:host=' . getenv('MYSQL_HOST') . ';dbname=' . getenv('MYSQL_DATABASE') . ';port=' . getenv('MYSQL_PORT'),
+                getenv('MYSQL_USER'),
+                getenv('MYSQL_PASSWORD')
             );
         } catch (PDOException $e) {
             die('Connection failed: ' . $e->getMessage());