Update Dockerfile

Dockerfile

@@ -5,16 +5,10 @@ USER root
 RUN apt-get update -y
 RUN apt-get install -y git libpq-dev gcc
 
-# Environment variables
-ENV DB_HOST $DB_HOST
-COPY .env .env
-
-# Set working directory
-WORKDIR /usr/src/app
-
 # Install basics
 USER jovyan
 RUN pip3 install --upgrade pip
+COPY .env .env
 
 # Install python packages
 COPY . .