Fix heroku deploy

Author: Michael Becker

Dockerfile

@@ -1,5 +1,6 @@
 FROM python:3.7.7-slim-buster
 ENV PARAMETERS=./defaults/webapp.cfg
+ENV PORT=8000
 WORKDIR /app
 COPY README.md .
 COPY setup.cfg .
@@ -10,6 +11,4 @@ COPY defaults defaults
 COPY src src
 COPY st_app.py st_app.py
 RUN pip install -q .
-
-CMD ["streamlit", "run", "st_app.py"]
-
+CMD STREAMLIT_SERVER_PORT=$PORT streamlit run st_app.py

heroku.yml

@@ -1,5 +1,5 @@
 build:
   docker:
-    web: Dockerfile.dash
+    web: Dockerfile
   config: 
     PORT: ${PORT}