[ci] Label 'ci::wheels only' pipeline.

.gitlab-ci.yml

@@ -69,3 +69,6 @@ include:
   - local: "/scripts/ci/pipelines/win.yml"
     rules:
       - if: $CI_MERGE_REQUEST_LABELS =~ /.*ci::win only.*/
+  - local: "/scripts/ci/pipelines/wheels.yml"
+    rules:
+      - if: $CI_MERGE_REQUEST_LABELS =~ /.*ci::wheels only.*/

scripts/ci/pipelines/wheels.yml

+wheels:
+  stage: build
+  needs: []
+  trigger:
+    include: /scripts/ci/jobs/build-wheels.yml
+    strategy: depend