Publish images with full Ruby version

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

.gitlab/ci/gitlab-kas.images.yml

@@ -0,0 +1,27 @@
+# Used by GitLab/KAS integration tests
+.gitlab-kas-base:
+  extends:
+    - .build_dynamic_image
+  stage: gitlab-kas
+  rules:
+    - !reference [.build_dynamic_image, rules]
+    - changes:
+        - "scripts/lib/custom-docker-build"
+        - ".gitlab/ci/kas.images.yml"
+
+gitlab-kas:
+  extends:
+    - .gitlab-kas-base
+  variables:
+    GOLANG: '1.21'
+    RUST: '1.73'
+    LFS: '2.9'
+    CHROME: '123'
+    YARN: '1.22'
+    GRAPHICSMAGICK: '1.3.36'
+    GIT: '2.36'
+    NODE: '20.12'
+    POSTGRESQL: '12'
+  parallel:
+    matrix:
+      - RUBY: ['3.0.6', '3.1.5', '3.2.4']