add flask sample

Signed-off-by: kouul <maulloohans@gmail.com>

flask/app/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:3.7-alpine 
+WORKDIR /app 
+COPY . /app 
+RUN pip3 install -r requirements.txt 
+ENTRYPOINT ["python3"] 
+CMD ["app.py"]

flask/app/app.py

@@ -0,0 +1,9 @@
+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+	return "Hello World!"
+
+if __name__ == '__main__':
+	app.run(host='0.0.0.0')

flask/app/requirements.txt

@@ -0,0 +1 @@
+flask