Modified Dockerfile & Flatpak build doc

packages/flatpak/Dockerfile

@@ -0,0 +1,7 @@
+FROM python:alpine3.7
+COPY . /app
+WORKDIR /app
+RUN pip install -r requirements.txt
+EXPOSE 5000
+ENTRYPOINT [ "python" ]
+CMD [ "server.py" ]

packages/flatpak/dockerfile

@@ -1,19 +0,0 @@
-FROM ubuntu:20.04
-
-MAINTANER Your Name "kuldeep.k@cisinlabs.com"
-
-RUN apt-get update -y && \
-    apt-get install -y python-pip python-dev
-
-# We copy just the requirements.txt first to leverage Docker cache
-COPY ./requirements.txt /app/requirements.txt
-
-WORKDIR /app
-
-RUN pip install -r requirements.txt
-
-COPY . /app
-
-ENTRYPOINT [ "python" ]
-
-CMD [ "server.py" ]

packages/flatpak/requirements.txt

@@ -1 +1 @@
-flask
+Flask