Dockerfile: install tree and rsync

tree: useful to inspect file system directory trees in debug sessions
rsync: needed to implement ssate cache mirrors on private factories

Signed-off-by: Jose Quaresma <jose.quaresma@foundries.io>

Dockerfile

@@ -56,7 +56,7 @@ RUN apt-get update \
 		make patch repo sudo texinfo vim-tiny wget whiptail libelf-dev git-lfs screen \
 		socket corkscrew curl xz-utils tcl libtinfo5 device-tree-compiler python3-pip python3-dev \
 		tmux libncurses-dev vim zstd lz4 liblz4-tool libc6-dev-i386 \
-		awscli docker-compose gosu xvfb python3-cairo python3-gi-cairo yaru-theme-icon \
+		awscli docker-compose gosu xvfb python3-cairo python3-gi-cairo yaru-theme-icon tree rsync \
 	&& ln -s /usr/bin/python3 /usr/bin/python \
 	&& pip3 --no-cache-dir install expandvars jsonFormatter \
 	&& apt-get autoremove -y \