Update CI jobs

 + We migrate to ocaml 4.03, so remove jobs of ocaml 4.00 and 4.01 and
 remove allowed failure for 4.03.
 + Distributions compiler may be too old too, allow failure.

.gitlab-ci.yml

@@ -6,21 +6,21 @@ stages:
   # Real distrubutions
   - real
 
-# OCaml version 4.00
-ocaml_400:
+# OCaml version 4.04
+ocaml_404:
   before_script:
     - sudo apk update && sudo apk add m4
   stage: other_version
-  image: ocaml/opam:alpine_ocaml-4.00.1
+  image: ocaml/opam:alpine_ocaml-4.04.0
   script: "./gitlab-ci.sh"
   allow_failure: true
 
-# OCaml version 4.01
-ocaml_401:
+# OCaml version 4.04
+ocaml_404_flambda:
   before_script:
     - sudo apk update && sudo apk add m4
   stage: other_version
-  image: ocaml/opam:alpine_ocaml-4.01.0
+  image: ocaml/opam:alpine_ocaml-4.04.0_flambda
   script: "./gitlab-ci.sh"
   allow_failure: true
 
@@ -31,7 +31,7 @@ ocaml_402:
   stage: test
   image: ocaml/opam:alpine_ocaml-4.02.3
   script: "./gitlab-ci.sh"
-  allow_failure: false
+  allow_failure: true
 
 # OCaml version 4.03
 ocaml_403:
@@ -40,7 +40,7 @@ ocaml_403:
   stage: other_version
   image: ocaml/opam:alpine_ocaml-4.03.0
   script: "./gitlab-ci.sh"
-  allow_failure: true
+  allow_failure: false
 
 # OCaml version 4.03, with flambda optimisation
 ocaml_403_flambda:
@@ -58,7 +58,7 @@ ubuntu:
   stage: real
   image: ocaml/opam:ubuntu
   script: "export OC_NOTEST=true; ./gitlab-ci.sh system"
-  allow_failure: false
+  allow_failure: true
 
 
 debian: