[librsvg-oci-images] Add clippy to openSUSE Tumbleweed image

[Federico Mena Quintero <federico src gnome org>]

commit cee7e9621b630e4340f3366dfd8bd77c82671ce3
Author: Sven Neumann <sven svenfoo org>
Date:   Fri Aug 28 10:52:53 2020 +0200

    Add clippy to openSUSE Tumbleweed image

 opensuse/tumbleweed | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/opensuse/tumbleweed b/opensuse/tumbleweed
index dbdaba2..f6621d2 100644
--- a/opensuse/tumbleweed
+++ b/opensuse/tumbleweed
@@ -3,7 +3,8 @@ FROM opensuse/tumbleweed
 ENV SHELL=/bin/bash
 
 RUN zypper update -y && \
-    zypper install -y gcc rust cargo rustfmt gdb rust-gdb rr make vala \
+    zypper install -y gcc rust cargo clippy rustfmt \
+    gdb rust-gdb rr make vala \
     automake autoconf libtool gettext itstool git \
     gtk-doc gobject-introspection-devel gtk3-devel \
     libxml2-devel libcroco-devel cairo-devel \