use grafana latest image, retry only executing job on main

.env.example

@@ -129,7 +129,7 @@ MINIO_FTP_PASV_PORTS=127.0.0.1:30000-30010:30000-30010
 ############################################################
 # visualization (grafana)
 ############################################################
-GRAFANA_IMAGE_TAG=10.4.15
+GRAFANA_IMAGE_TAG=latest
 GRAFANA_USER=grafana
 GRAFANA_PASSWORD=grafana
 GRAFANA_URL=http://visualization:3000

.gitlab/ci/cve-scan.gitlab-ci.yml

@@ -24,7 +24,7 @@ docker-image-scan:
     paths:
       - "*.cve"
     expire_in: 30 days
-  only:
-    - "main"
+  rules:
+    - if: $CI_COMMIT_REF_SLUG == $CI_DEFAULT_BRANCH
   tags:
     - "dind"
\ No newline at end of file