Fix session config for docker image

Dockerfile.run

@@ -2,10 +2,10 @@ FROM alpine
 
 RUN apk --update add ca-certificates
 
-ADD play-with-docker /bin/play-with-docker
-COPY ./www /bin/www
+ADD play-with-docker /app/play-with-docker
+COPY ./www /app/www
 
-WORKDIR /bin
-CMD ["play-with-docker"]
+WORKDIR /app
+CMD ["./play-with-docker"]
 
 EXPOSE 3000