ci: Wait for 'check-commit-log' before continuing

The check-commit-log is quick, and to get a result early is helpful as
one can then more quickly check for failures via the report provided via
the JUnit report.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/141>

.gitlab-ci.yml

@@ -19,8 +19,7 @@ check_commit_log:
     stage: review
     script:
         - ./.gitlab-ci/check-commit-log.sh
-    only:
-        - merge_requests
+    <<: *only_default
     artifacts:
         expire_in: 1 week
         paths:
@@ -52,7 +51,7 @@ eslint:
 
 build-bundles:
   stage: build
-  needs: []
+  needs: ["check_commit_log"]
   script:
     - ./export-zips.sh
   <<: *only_default

.gitlab-ci/check-commit-log.sh

@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 if [ -z "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" ]; then
-  echo Cannot review non-merge request
-  exit 1
+  echo This is not a merge request, skipping
+  exit 0
 fi
 
 git fetch $CI_MERGE_REQUEST_PROJECT_URL.git $CI_MERGE_REQUEST_TARGET_BRANCH_NAME