Remove default env variables

Dockerfile

@@ -22,11 +22,6 @@ COPY app.py .
 # expose port
 EXPOSE 8000
 
-# default ENV (you can override these in your orchestrator)
-ENV BEAVERHABITS_URL="http://beaverhabits.lan" \
-    BEAVERHABITS_USERNAME="changeme" \
-    BEAVERHABITS_PASSWORD="changeme"
-
 # use a non-root user if you like; for brevity we run as root.
 
 # run via Gunicorn WSGI server with 4 workers
@@ -35,4 +30,4 @@ CMD ["gunicorn", "app:app", \
      "--workers", "4", \
      "--threads", "4", \
      "--access-logfile", "-", \
-     "--error-logfile", "-"]
+     "--error-logfile", "-"]