mark nightly builds with commit sha

.gitlab-ci.yml

@@ -77,6 +77,8 @@ release-nightly:
     name: gcr.io/kaniko-project/executor:v1.23.2-debug
     entrypoint: [""]
   script:
+    - sed -i '/^const VERSION/d' config/consts.go
+    - echo "const VERSION = \"nightly-${CI_COMMIT_SHORT_SHA}\"" > config/consts.go
     - echo "{\"auths\":{\"https://index.docker.io/v1/\":{\"auth\":\"${CI_REGISTRY_TOKEN}\"}}}" > /kaniko/.docker/config.json
     - cat /kaniko/.docker/config.json
     - /kaniko/executor