[Dockerfile] using ADD instead of wget, was there since was in a separate repository

Dockerfile

@@ -9,6 +9,9 @@ ENV LC_ALL=en_US.UTF-8
 ADD ./script/post-upgrade.sh /post-upgrade.sh
 RUN /bin/bash /post-upgrade.sh  && rm -rf /post-upgrade.sh
 ADD ./script/depcheck /usr/local/bin/depcheck
+# Adding our builder script that will run also as entrypoint
+ADD ./script/builder /builder
+RUN chmod +x /builder
 
 # Set environment variables.
 ENV HOME /root
@@ -16,9 +19,6 @@ ENV HOME /root
 # Define working directory.
 WORKDIR /
 
-# Adding our builder script that will run also as entrypoint
-RUN wget 'https://raw.githubusercontent.com/Sabayon/docker-builder-amd64/master/script/builder' -O /builder && chmod +x /builder
-
 # Define standard volumes
 VOLUME ["/usr/portage", "/usr/portage/distfiles", "/usr/portage/packages", "/var/lib/entropy/client/packages"]