provide trigger to test against latest iris

.gitlab-ci.yml

@@ -44,3 +44,12 @@ build-coq.8.7.2:
     paths:
     - build-time.txt
     - build-env.txt
+
+build-iris.dev:
+  <<: *template
+  variables:
+    OPAM_PINS: "coq version 8.7.2   coq-iris.dev git https://gitlab.mpi-sws.org/FP/iris-coq.git#$IRIS_REV"
+  except:
+  only:
+  - triggers
+  - schedules