tweaked dockerfile.

Dockerfile

@@ -1,5 +1,6 @@
 FROM alpine:3.8
 ARG user=eephttpd
+ARG path=example/path
 ENV samhost=sam-host
 ENV samport=7656
 ENV args="-r"
@@ -15,5 +16,5 @@ RUN install -m755 bin/eephttpd /usr/bin/eephttpd
 USER $user
 WORKDIR /opt/$user/
 VOLUME /opt/$user/
-COPY example/www /opt/$user/www
+COPY $path /opt/$user/www
 CMD eephttpd -sh=$samhost -sp=$samport $args