venus/ci: add manual/nightly venus-lavapipe-full

Technically not a "full" pipeline because that would take 12h, but
1/6 is much closer to it than the 1/60 that we can have in the merge
pipeline.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29803>

src/virtio/ci/gitlab-ci-inc.yml

@@ -7,6 +7,14 @@
         - src/virtio/**/*
       when: on_success
 
+.venus-manual-rules:
+  stage: layered-backends
+  rules:
+    - !reference [.test, rules]
+    - !reference [.lavapipe-manual-rules, rules]
+    - changes: *venus_file_list
+      when: manual
+
 
 .venus-lavapipe-test:
   extends:

src/virtio/ci/gitlab-ci.yml

@@ -16,3 +16,11 @@ include:
     FLAKES_CHANNEL: "#virgl-ci"
   script:
     - ./install/crosvm-runner.sh ./install/deqp-runner.sh
+
+venus-lavapipe-full:
+  extends:
+    - .venus-lavapipe
+    - .venus-manual-rules
+  timeout: 3h
+  variables:
+    DEQP_FRACTION: 6  # 1 would take 12h so this is as close as we can get