Move script to .docker

Author: gsoldevila

install_packages.sh .docker/install_packages.shinstall_packages.sh renamed to .docker/install_packages.sh

@@ -15,8 +15,7 @@ RUN echo "deb http://archive.debian.org/debian/ buster main" > /etc/apt/sources.
 
 # TODO install_packages calls apt-get update and then nukes the list files after. We should avoid multiple calls to apt-get update.....
 # We could probably fix this by running the update and installs ourself with `RUN --mount type=cache` but that is "experimental"
-COPY install_packages.sh /usr/local/bin/
-RUN chmod 755 /usr/local/bin/install_packages.sh
+COPY --chmod=755 .docker/install_packages.sh /usr/local/bin/
 
 # Fix for Debian Buster EOL - point to archive repositories
 RUN sed -i 's/deb.debian.org/archive.debian.org/g' /etc/apt/sources.list && \