add base web + change a container

web/app.py

@@ -0,0 +1,17 @@
+# flask-app/app.py
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask import render_template
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://flaskuser:flaskpass@mariadb/flaskdb'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+db = SQLAlchemy(app)
+
+    @app.route('/')
+    def index():
+        return render_template('index.html')
+        
+if __name__ == '__main__':
+    app.run(host='0.0.0.0')