fix(ci): fall back on jalhyd devel branch instead of master if the requested...

fix(ci): fall back on jalhyd devel branch instead of master if the requested jalhyd branch does not exists

This allows to run CI jobs on a nghyd developpement branch when the corresponding jalhyd branch has already been merged into devel.

.gitlab-ci.yml

@@ -60,7 +60,7 @@ jalhyd:
     - rm -rf jalhyd
     - git clone https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.irstea.fr/cassiopee/jalhyd.git
     - cd jalhyd
-    - git checkout "$JALHYD_BRANCH" || git checkout master
+    - git checkout "$JALHYD_BRANCH" || git checkout devel
     - npm ci --force
     - npm run build