Allow run config to be set in container via ENV

Dockerfile

@@ -6,6 +6,11 @@ RUN make
 FROM ubuntu as base
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=build /app/bin/mproxy /usr/local/bin/
-EXPOSE 80 443
 
-CMD [ "mproxy", "run" ]
+ENV HTTP_PORT=80
+ENV HTTPS_PORT=443
+ENV DEBUG=false
+
+EXPOSE $HTTP_PORT $HTTPS_PORT
+
+CMD mproxy run --http-port=${HTTP_PORT} --https-port=${HTTPS_PORT} --debug=${DEBUG}