Minor changes in dockerfile

Dockerfile

     curl \
     git \
     make \
-    upx \
-  && update-ca-certificates
+    upx
 
 COPY . /go/src/github.com/9seconds/mtg/
 
 
 FROM scratch
 
-ENTRYPOINT ["/usr/local/bin/mtg"]
+ENTRYPOINT ["/mtg"]
 ENV MTG_IP=0.0.0.0 \
     MTG_PORT=3128 \
     MTG_STATS_IP=0.0.0.0 \
 EXPOSE 3128 3129
 
 COPY --from=0 /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=0 /go/src/github.com/9seconds/mtg/mtg /usr/local/bin/mtg
+COPY --from=0 /go/src/github.com/9seconds/mtg/mtg /mtg