gitlab: Add an rpi to the sjg lab

I have an original rpi installed now, loaded with OS Lite (32-bit)
Add an entry for it so that it can be used for testing.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

.gitlab-ci.yml

@@ -678,3 +678,8 @@ nyan-big:
   variables:
     ROLE: nyan-big
   <<: *lab_dfn
+
+rpi:
+  variables:
+    ROLE: rpi
+  <<: *lab_dfn