feat: delete images older than two builds ago

jenkins/Jenkinsfile

@@ -60,7 +60,10 @@ pipeline {
       archiveArtifacts artifacts: "reports/${BUILD_NUMBER}/**/* , build/**/*, ganache/*", fingerprint: true, allowEmptyArchive: true
       sleep 2
       sh 'docker images | grep -E "ecentrics/concordia.+tests" | tr -s \' \' | cut -d \' \' -f 3 | xargs --no-run-if-empty docker rmi -f || true'
-//       sh 'docker images | grep -E "ecentrics/concordia.+staging" | tr -s \' \' | cut -d \' \' -f 3 | xargs --no-run-if-empty docker rmi -f || true'
+
+      sh 'docker images | tr -s \' \' | grep -E "ecentrics/concordia.+staging-b" | sed -r \'s/(v.*-staging-b)([0-9]*)/\1\2 \2/g\' | awk \'{ if ($3 < ($BUILD_NUMBER - 2)) print $1":"$2}\' | xargs --no-run-if-empty docker rmi -f || true'
+      sh 'docker images | tr -s \' \' | grep -E "ecentrics/concordia.+production-b" | sed -r \'s/(v.*-production-b)([0-9]*)/\1\2 \2/g\' | awk \'{ if ($3 < ($BUILD_NUMBER - 2)) print $1":"$2}\' | xargs --no-run-if-empty docker rmi -f || true'
+
       sh 'docker system prune -f'
       sh 'rm -rf reports'
       sh 'rm -rf build'