adapt to lack of multiple macos runners

#12709 (comment)

scripts/ci/gitlab/pipeline/test.yml

@@ -416,7 +416,6 @@ check-rustdoc:
   extends:
     - .docker-env
     - .test-refs
-  parallel: 2
 
 cargo-check-each-crate:
   <<: *cargo-check-each-crate_template
@@ -432,10 +431,13 @@ cargo-check-each-crate:
     - ./scripts/ci/gitlab/check-each-crate.sh "$CI_NODE_INDEX" "$CI_NODE_TOTAL"
     # need to update cache only from one job
     - if [ "$CI_NODE_INDEX" == 1 ]; then rusty-cachier cache upload; fi
+  parallel: 2
 
 cargo-check-each-crate-macos:
   <<: *cargo-check-each-crate_template
   script:
-    - ./scripts/ci/gitlab/check-each-crate.sh "$CI_NODE_INDEX" "$CI_NODE_TOTAL"
+    # TODO: enable rusty-cachier once it supports Mac
+    # TODO: use parallel jobs, as per cargo-check-each-crate, once more Mac runners are available
+    - ./scripts/ci/gitlab/check-each-crate.sh 1 1
   tags:
     - osx