Add support for SLES 12 SP 5

.gitlab-ci.yml

@@ -193,6 +193,23 @@ upload/SUSE/15.0:
   dependencies:
     - build/sles/15.0
 
+build/sles/12.5:
+  <<: *build
+  variables:
+    DOCKER_IMAGE: sles/12.5
+
+test/sles/12.5:
+  <<: *test
+  variables:
+    DOCKER_IMAGE: sles/12.5
+  dependencies:
+    - build/sles/12.5
+
+upload/SUSE/12.5:
+  <<: *upload
+  dependencies:
+    - build/sles/12.5
+
 build/sles/12.4:
   <<: *build
   variables: