Publish images with full Ruby version

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

.gitlab/ci/customers.images.yml

@@ -1,7 +1,7 @@
----
-.customers:
+.customers-base:
   extends:
     - .build_dynamic_image
+  stage: customers
   rules:
     - !reference [.build_dynamic_image, rules]
     - changes:
@@ -11,9 +11,9 @@
 # Used by customers-gitlab-com rspec job: https://gitlab.com/gitlab-org/customers-gitlab-com/-/blob/staging/.gitlab-ci.yml
 customers:
   extends:
-    - .customers
+    - .customers-base
   variables:
-    RUBY: '3.2'
+    RUBY: '3.2.4'
     LFS: '2.9'
     CHROME: '119'
     NODE: '20.12'
@@ -27,9 +27,9 @@ customers:
 # Used by customers-gitlab-com qa e2e test: https://gitlab.com/gitlab-org/customers-gitlab-com/-/blob/staging/.gitlab/ci/e2e.gitlab-ci.yml
 customers-qa-assets:
   extends:
-    - .customers
+    - .customers-base
   variables:
-    RUBY: '3.2'
+    RUBY: '3.2.4'
     CHROME: '119'
     NODE: '20.12'
     YARN: '1.22'