add job for nightly build

.gitlab-ci.yml

@@ -37,3 +37,11 @@ build-coq.8.8.2:
   variables:
     OPAM_PINS: "coq version 8.8.2"
 
+build-iris.dev:
+  <<: *template
+  variables:
+    OPAM_PINS: "coq version 8.8.2   coq-stdpp.dev git git+https://gitlab.mpi-sws.org/robbertkrebbers/coq-stdpp/#$STDPP_REV  coq-iris.dev git git+https://gitlab.mpi-sws.org/FP/iris-coq.git#$IRIS_REV"
+  except:
+  only:
+  - triggers
+  - schedules