missing apt update?

.gitlab-ci.yml

@@ -137,6 +137,7 @@ image: ocaml/opam:debian-testing-opam
     #   opam install . --deps-only --locked --with-test --with-doc --yes
     # which should start by installing depexts
     # (possibly we will need to set some explicit environment variable first).
+    - sudo apt-get update -qq
     - opam install depext --yes
     - opam install . --dry-run --deps-only --locked --with-test --with-doc --yes | awk '/-> installed/{print $3}' | xargs opam depext -iy
     # the magical command above comes from https://github.com/ocaml/opam/issues/3790
@@ -236,7 +237,7 @@ ctest:
     - if: $DUNE_TEST_TARGETS != ""
 
   script:
-    - sudo apt-get update -qq && sudo apt-get install -y -qq xsltproc
+    - sudo apt-get install -y -qq xsltproc
     - echo -e "section_start:`date +%s`:project_tests\r\e[0K run the tests"
     - if [ "$DUNE_TEST_TARGETS" != "" ]; then dune build $DUNE_TEST_TARGETS --display short --no-buffer; else echo "skipped (DUNE_TEST_TARGETS is empty)"; fi
     - echo -e "section_end:`date +%s`:project_tests\r\e[0K"