Gitlab sage, Docker: Add snmp and rsync

Add snmp and rsync to the normal docker image. While these tools are
only required for the lab on sage, I think it's a small enough addition
to be worth always including at this point. A higher level TODO I think
may be to see if we can / should split the resulting container up, or
if there's host tooling we can remove at a later step, after building
all the software we require.

Signed-off-by: Tom Rini <trini@konsulko.com>

tools/docker/Dockerfile

@@ -131,7 +131,9 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 	python3-tomli \
 	python3-venv \
 	rpm2cpio \
+	rsync \
 	sbsigntool \
+	snmp \
 	socat \
 	softhsm2 \
 	sparse \