refactor: Implement Docker, MySQL logging, and SMTP email

This commit refactors the application to run in a containerized environment using Docker and Docker Compose. It also introduces a MySQL database for logging user requests and updates the print functionality to send emails via SMTP.

Key changes:
- Added `Dockerfile` and `docker-compose.yml` for containerization.
- Integrated a MySQL database for logging user requests.
- Updated the print module to send files as email attachments via SMTP.
- Added and updated configuration files (`.env`, `.env.example`) to manage secrets and environment variables.
- Removed hardcoded credentials from version control.
- Updated `Readme.md` with new setup and execution instructions.

docker-compose.yml

@@ -8,7 +8,7 @@ services:
     env_file:
       - .env
     environment:
-      - DATABASE_URL=mysql+mysqlconnector://user:password@db:3306/vanessa_logs
+      - DATABASE_URL=mysql+mysqlconnector://${MYSQL_USER}:${MYSQL_PASSWORD}@db:3306/${MYSQL_DATABASE}
     depends_on:
       - db
     volumes:
@@ -19,14 +19,12 @@ services:
     container_name: vanessa_db
     restart: always
     environment:
-      MYSQL_DATABASE: vanessa_logs
-      MYSQL_USER: user
-      MYSQL_PASSWORD: password
-      MYSQL_ROOT_PASSWORD: rootpassword
+      MYSQL_DATABASE: ${MYSQL_DATABASE}
+      MYSQL_USER: ${MYSQL_USER}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
     volumes:
       - mysql_data:/var/lib/mysql
-    ports:
-      - "3306:3306"
 
 volumes:
   mysql_data: