externalizes yajsv image as parameter

templates/validation.yml

@@ -8,11 +8,15 @@ spec:
       description: base URL for schema files
       type: string
       default: "https://gitlab.com/api/v4/projects/to-be-continuous%2Fkicker/repository/files"
+    yajsv-image:
+      description: image to use for validation jobs
+      type: string
+      default: cicd-docker-dev.artifact.tecnalia.com/yajsv:latest
 
 ---
 
 variables:
-  YAJSV_IMAGE: "cicd-docker-dev-local.artifact.tecnalia.com/yajsv:latest"
+  YAJSV_IMAGE: $[[ inputs.yajsv-image ]]
 
 .kicker-scripts: &kicker-scripts |
   set -e