another try

.gitlab-ci.jsonnet

@@ -7,7 +7,7 @@ local param_job(image,tag_var, merge = {}) = std.mergePatch({
       name: 'gcr.io/kaniko-project/executor:debug',
       entrypoint: [''],
     },
-    variables: {GOPROXY_ENV: '$GOPROXY'}
+    variables: {GOPROXY_ENV: '$GOPROXY'},
     script: [
         'mkdir -p /kaniko/.docker',
         @'echo "{\"auths\":{\"${CI_REGISTRY}\":{\"auth\":\"$(printf "%s:%s" "${CI_REGISTRY_USER}" "${CI_REGISTRY_PASSWORD}" | base64)\"}}}" > /kaniko/.docker/config.json',