ci: Experiment with the new !reference CI keyword

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab/ci/rails.gitlab-ci.yml

@@ -6,12 +6,17 @@
     - .default-before_script
     - .rails-cache
 
-.base-script: &base-script
-  # Only install knapsack after bundle install! Otherwise oddly some native
-  # gems could not be found under some circumstance. No idea why, hours wasted.
-  - run_timed_command "gem install knapsack --no-document"
-  - run_timed_command "scripts/gitaly-test-spawn"
-  - source ./scripts/rspec_helpers.sh
+.minimal-bundle-install:
+  script:
+    - run_timed_command "bundle install --jobs=$(nproc) --path=vendor --retry=3 --quiet --without default development test production puma unicorn kerberos metrics omnibus ed25519"
+
+.base-script:
+  script:
+    # Only install knapsack after bundle install! Otherwise oddly some native
+    # gems could not be found under some circumstance. No idea why, hours wasted.
+    - run_timed_command "gem install knapsack --no-document"
+    - run_timed_command "scripts/gitaly-test-spawn"
+    - source ./scripts/rspec_helpers.sh
 
 .minimal-rspec-tests:
   variables:
@@ -27,7 +32,7 @@
     RECORD_DEPRECATIONS: "true"
   needs: ["setup-test-env", "retrieve-tests-metadata", "compile-test-assets", "detect-tests"]
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_paralellized_job "--tag ~quarantine --tag ~geo --tag ~level:migration"
   artifacts:
     expire_in: 31d
@@ -49,7 +54,7 @@
 .rspec-base-migration:
   extends: .rails:rules:ee-and-foss-migration
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_paralellized_job "--tag ~quarantine --tag ~geo --tag level:migration"
 
 .rspec-base-pg11:
@@ -82,7 +87,7 @@
 .rspec-ee-base-geo:
   extends: .rspec-base
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_paralellized_job "--tag ~quarantine --tag geo"
 
 .rspec-ee-base-geo-pg11:
@@ -213,7 +218,7 @@ update-coverage-cache:
     - .shared:rules:update-cache
   stage: prepare
   script:
-    - run_timed_command "bundle install --jobs=$(nproc) --path=vendor --retry=3 --quiet --without default development test production puma unicorn kerberos metrics omnibus ed25519"
+    - !reference [.minimal-bundle-install, script]
   cache:
     policy: push  # We want to rebuild the cache from scratch to ensure stale dependencies are cleaned up.
 
@@ -317,7 +322,7 @@ rspec db-library-code pg12:
     - .rspec-base-pg12
     - .rails:rules:ee-and-foss-db-library-code
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_db_library_code
 
 rspec fast_spec_helper:
@@ -406,7 +411,7 @@ gitlab:setup:
     # db/fixtures/development/04_project.rb thanks to SIZE=1 below
     - git clone https://gitlab.com/gitlab-org/gitlab-test.git
        /home/git/repositories/gitlab-org/gitlab-test.git
-    - *base-script
+    - !reference [.base-script, script]
     - force=yes SIZE=1 FIXTURE_PATH="db/fixtures/development" bundle exec rake gitlab:setup
   artifacts:
     when: on_failure
@@ -486,7 +491,7 @@ rspec:coverage:
     - memory-static
     - memory-on-boot
   script:
-    - run_timed_command "bundle install --jobs=$(nproc) --path=vendor --retry=3 --quiet --without default development test production puma unicorn kerberos metrics omnibus ed25519"
+    - !reference [.minimal-bundle-install, script]
     - run_timed_command "bundle exec scripts/merge-simplecov"
     - run_timed_command "bundle exec scripts/gather-test-memory-data"
   coverage: '/LOC \((\d+\.\d+%)\) covered.$/'
@@ -523,7 +528,7 @@ rspec:feature-flags:
     - memory-static
     - memory-on-boot
   script:
-    - run_timed_command "bundle install --jobs=$(nproc) --path=vendor --retry=3 --quiet --without default development test production puma unicorn kerberos metrics omnibus ed25519"
+    - !reference [.minimal-bundle-install, script]
     - if [ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]; then
         run_timed_command "bundle exec scripts/used-feature-flags" || (scripts/slack master-broken "☠️ \`${CI_JOB_NAME}\` failed! ☠️ See ${CI_JOB_URL}" ci_failing "GitLab Bot" && exit 1);
       else
@@ -763,7 +768,7 @@ rspec fail-fast:
   stage: test
   needs: ["setup-test-env", "retrieve-tests-metadata", "compile-test-assets", "detect-tests"]
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_fail_fast tmp/matching_tests.txt "--tag ~quarantine"
   artifacts:
     expire_in: 7d
@@ -776,7 +781,7 @@ rspec foss-impact:
     - .rails:rules:rspec-foss-impact
   needs: ["setup-test-env", "retrieve-tests-metadata", "compile-test-assets as-if-foss", "detect-tests as-if-foss"]
   script:
-    - *base-script
+    - !reference [.base-script, script]
     - rspec_matched_foss_tests tmp/matching_foss_tests.txt "--tag ~quarantine"
   artifacts:
     expire_in: 7d