Test the current script, not the one in the main branch

Since the pipeline is meant to be `include:`d from other repositories
by default it tries to retrieve the `update_test_binaries.sh` script
with a HTTP call.

However this means that the test pipeline on a specific commit is not
actually testing the `update_test_binaries.sh` script on the same
commit, but it retrieves it from the `$osname/$release` branch (in this
case, `apertis/v2023dev1`).

Tweak things to ensure the current `update_test_binaries.sh` is used
during testing.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

.gitlab-ci.yml

@@ -14,7 +14,9 @@ test-glib-gio-fs:
   variables:
     GIT_PUSH_URL: ""
     TESTCASE: glib-gio-fs
+    SCRIPT_URL: ""
   before_script:
+    - cp update_test_binaries.sh /tmp
     - git clone "${CI_SERVER_URL}/tests/$TESTCASE.git/" "$TESTCASE"
     - cd "$TESTCASE"
     - git checkout 829f401b

gitlab-ci/update-test-binaries.yaml

@@ -4,10 +4,11 @@
     - lightweight
   variables:
     BRANCH: $CI_COMMIT_BRANCH
+    SCRIPT_URL: ${CI_SERVER_URL}/tests/helper-tools/-/raw/${osname}/${release}/update_test_binaries.sh
     GIT_PUSH_URL: https://${GITLAB_CI_USER}:${GITLAB_CI_PASSWORD}@${CI_SERVER_HOST}/${CI_PROJECT_PATH}.git/
   script:
     - env --null | sort -z | tr '\0' '\n'
-    - wget ${CI_SERVER_URL}/tests/helper-tools/-/raw/${osname}/${release}/update_test_binaries.sh -O /tmp/update_test_binaries.sh
+    - test -n "$SCRIPT_URL" && wget "$SCRIPT_URL" -O /tmp/update_test_binaries.sh
     - bash /tmp/update_test_binaries.sh --release "${release}" --branch "$BRANCH" --repository . --dry-run
     - git show
     - if [ -n "$GIT_PUSH_URL" ]; then git push "${GIT_PUSH_URL}" "HEAD:${BRANCH}"; fi