reduce docker size for x86

Dockerfile

@@ -6,10 +6,14 @@ COPY . /v4l2rtspserver
 
 RUN apt-get update && apt-get install -y --no-install-recommends g++ autoconf automake libtool xz-utils cmake make liblog4cpp5-dev pkg-config git wget
 
-RUN cmake . && make \
-	&& apt-get clean
+RUN cmake . && make install && apt-get clean && rm -rf /var/lib/apt/lists/
+
+FROM ubuntu:18.04
+
+WORKDIR /usr/local/share/v4l2rtspserver
+COPY --from=builder /usr/local/bin/ /usr/local/bin/
 
 EXPOSE 8554
 
-ENTRYPOINT [ "./v4l2rtspserver" ]
+ENTRYPOINT [ "/usr/local/bin/v4l2rtspserver" ]
 CMD [ "-S -P ${PORT}" ]