Update containerBuildPushGeneric.groovy

Author: beedemo-dev

vars/containerBuildPushGeneric.groovy

@@ -24,8 +24,8 @@ def call(String imageName, String imageTag = env.BUILD_NUMBER, String gcpProject
       container('gcp-sdk') {
         try {
           sh "printenv"
-          sh "echo $prevImageTag"
-          sh "gcloud container images delete ${dockerReg}/${imageName}:${prevImageTag}  --force-delete-tags --quiet"
+          sh "echo ${env.prevImageTag}"
+          sh "gcloud container images delete ${dockerReg}/${imageName}:${env.prevImageTag}  --force-delete-tags --quiet"
         } catch(e) {}
       }
       container('img') {