fix(template): add YAJSV_IMAGE var

variables:

  YAJSV_IMAGE: amux/yajsv:latest

.kicker-scripts: &kicker-scripts |

  set -e

  function log_info() {

# $JSON_FILE  : the JSON file to test

# $SCHEMA_URL : the schema url

.json-validation:

  image: amux/yajsv:latest

  image: ${YAJSV_IMAGE}

  stage: build

  before_script:

    - *kicker-scripts