add explaination of .env file

Author: BigSpaceships

.gitignore

@@ -139,3 +139,5 @@ dmypy.json
 .pyre/
 
 # End of https://www.gitignore.io/api/macos,python
+
+.env

Dockerfile

@@ -14,5 +14,4 @@ RUN mkdir -p /usr/local/var
 RUN chown jumpstart:jumpstart /usr/local/var
 USER jumpstart
 
-# CMD ["gunicorn", "jumpstart:app"]
 CMD ["sh", "-c", "gunicorn jumpstart:app --bind=0.0.0.0:8080 --access-logfile - --error-log - --capture-output --timeout=600"]

README.md

@@ -35,3 +35,10 @@ docker run \
     -p 8080:8080 \
     jumpstart
 ```
+3. You can also use a `.env` file:
+```
+docker run \
+    --env-file='.env'
+    -p 8080:8080
+    jumpstart
+```