Disable cloudbuild for old mariadb versions, remove from images list

Author: DrauzJu

cloudbuild.pickware-io.yaml

@@ -21,6 +21,4 @@ steps:
 images:
   - 'eu.gcr.io/pickware-io/mysql:5.7'
   - 'eu.gcr.io/pickware-io/mysql:8.0'
-  - 'eu.gcr.io/pickware-io/mysql:mariadb-10.2.17'
-  - 'eu.gcr.io/pickware-io/mysql:mariadb-10.2.23'
   - 'eu.gcr.io/pickware-io/mysql:mariadb-latest'