added flask backend

backends/flask-backend/app.py

+from flask import Flask
+import json
+import logging
+import mariadb
+from os import environ
+
+config = {
+    'host': environ.get('DB_HOST'),
+    'port': int(environ.get('DB_PORT')),
+    'user': environ.get('DB_USER'),
+    'password': environ.get('DB_PASS'),
+    'database': environ.get('DB_NAME')
+}
+
+app = Flask(__name__)
+
+gunicorn_error_logger = logging.getLogger('gunicorn.error')
+app.logger.handlers.extend(gunicorn_error_logger.handlers)
+app.logger.setLevel(logging.INFO)
+
+# queries the Menu table and returns the output in json format.
+
+@app.route('/', methods=['GET'])
+def index():
+   #connection for MariaDB
+   conn = mariadb.connect(**config)
+#   conn = mysql.connector.connect(**config)
+   # create a connection cursor
+   cur = conn.cursor()
+   # execute a SQL statement
+   cur.execute("select * from Employees")
+
+   # serialize results into JSON
+   row_headers=[x[0] for x in cur.description]
+   rv = cur.fetchall()
+   json_data=[]
+   for result in rv:
+        json_data.append(dict(zip(row_headers,result)))
+
+   # return the results!
+   return json.dumps(json_data)
+
+if __name__ == "__main__":
+    app.run(host='0.0.0.0', port=5000, debug=True, threaded=True)
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backends/flask-backend/flask.Dockerfile

+# syntax=docker/dockerfile:1
+
+FROM  ubuntu:focal
+
+WORKDIR /tukkar-app
+RUN apt-get update && apt-get install -y libmariadb3 libmariadb-dev python3-pip
+
+COPY requirements.txt requirements.txt
+RUN pip3 install -r requirements.txt
+
+COPY . .
+EXPOSE 5000
+CMD [ "python3", "-m" , "flask", "run", "--host=0.0.0.0"]
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backends/flask-backend/requirements.txt

+Flask==2.0.3
+gunicorn==20.1.0
+mariadb
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