WIP: Replicate gnome-desktop wallclock bug

The gnome-desktop CI hasn't been working for a while because of changes
in gnome-desktop, or the Fedora system underneath.

Try to replicate this bug.
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 765fb5d..f7faa48 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,6 +41,7 @@
     # because it breaks static link.
     - meson configure -Ddtrace=false _build
     - ninja -C _build install
+    - LC_ALL=he_IL.utf8 ./_build/tests/datetime "%a ה־%-e ב%b_%R:%S"
     - GLIB_TEST_COMPILATION=1 $HOME/glib-installed/libexec/installed-tests/glib/static-link.py $HOME/glib-installed/lib/pkgconfig
   artifacts:
     name: "glib-${CI_JOB_NAME}-${CI_COMMIT_REF_NAME}"
diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index c03a9ab..747aa76 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM fedora:27
+FROM fedora:rawhide
 
 RUN dnf -y install \
     autoconf \
@@ -23,6 +23,7 @@
     glibc-langpack-es \
     glibc-langpack-fa \
     glibc-langpack-fr \
+    glibc-langpack-he \
     glibc-langpack-hr \
     glibc-langpack-ja \
     glibc-langpack-lt \