Publish images with full Ruby version

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

.gitlab/ci/gitlab-cng.images.yml

@@ -0,0 +1,25 @@
+# Used by GitLab: https://gitlab.com/gitlab-org/gitlab/blob/master/.gitlab-ci.yml
+.gitlab-cng-base:
+  extends:
+    - .build_dynamic_image
+  stage: gitlab-cng
+  variables:
+    LFS: '2.9'
+    CHROME: '123'
+    NODE: '20.12'
+    YARN: '1.22'
+    GRAPHICSMAGICK: '1.3.36'
+    POSTGRESQL: '11'
+    RUBY: '3.0.6'
+    GIT: '2.33'
+    GOLANG: '1.21'
+    KUBECTL: '1.23'
+    HELM: '3.9'
+
+gitlab-cng:
+  extends:
+    - .gitlab-cng-base
+  rules:
+    - !reference [.build_dynamic_image, rules]
+    - changes:
+        - ".gitlab/ci/cng-images.yml"