Feat: Dev Container configuration to simplify local setup

.devcontainer/Dockerfile

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+ARG BASE_IMAGE=librebooking/librebooking:develop
+FROM ${BASE_IMAGE}
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Configure PHP memory and Xdebug defaults for development
+RUN set -eux; \
+  echo 'memory_limit = 2048M' > /usr/local/etc/php/conf.d/docker-php-memlimit.ini; \
+  { \
+  echo 'xdebug.mode=debug,develop'; \
+  echo 'xdebug.start_with_request=yes'; \
+  echo 'xdebug.discover_client_host=1'; \
+  echo 'xdebug.log_level=0'; \
+  } > /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
+WORKDIR /
+VOLUME /config
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["apache2-foreground"]

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/php
+{
+    "name": "LibreBooking Development",
+    "dockerComposeFile": [
+        "./docker-compose.devcontainer.yml"
+    ],
+    "service": "librebooking",
+    "runServices": [
+        "librebooking",
+        "db"
+    ],
+    "workspaceFolder": "/var/www/html",
+    "mounts": [
+        "type=bind,source=${localWorkspaceFolder},target=/var/www/html,consistency=cached"
+    ],
+    "forwardPorts": [
+        80
+    ],
+    "postCreateCommand": "composer install --ignore-platform-req=ext-gd",
+    "postStartCommand": "chown -R www-data:www-data /var/www/html/uploads /var/www/html/tpl_c",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "xdebug.php-debug",
+                "bmewburn.vscode-intelephense-client",
+                "EditorConfig.EditorConfig"
+            ],
+            "settings": {
+                "php.validate.executablePath": "/usr/local/bin/php"
+            }
+        }
+    },
+    "shutdownAction": "stopCompose"
+}

.devcontainer/docker-compose.devcontainer.yml

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+services:
+  librebooking:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: librebooking-app
+    depends_on:
+      - db
+    ports:
+      - "80:80"
+    environment:
+      - LB_APP_TITLE=LibreBooking-Dev
+      - LB_DATABASE_HOSTSPEC=librebooking-db
+      - LB_DATABASE_USER=librebooking
+      - LB_DATABASE_PASSWORD=devpass
+      - LB_DATABASE_NAME=librebooking
+      - LB_ENV=development
+      - TZ=UTC
+  db:
+    image: mariadb:12.0.2
+    container_name: librebooking-db
+    environment:
+      - MYSQL_ROOT_PASSWORD=devpass
+      - MYSQL_DATABASE=librebooking
+      - MYSQL_USER=librebooking
+      - MYSQL_PASSWORD=devpass
+    volumes:
+      - ./init.sql:/docker-entrypoint-initdb.d/init.sql