'Using single-quotes in Jenkins Declarative Pipeline for credentials doesn't pass the full secret text

Following the instructions here: https://www.jenkins.io/doc/book/pipeline/jenkinsfile/#string-interpolation

I wrote this code on the Jenkinsfile:

    (...) stage("publish"){
            steps{
                withCredentials([string(credentialsId: 'ECR_authenticate', variable: 'get_authenticate')]) {
                echo "pushing the image to AWS ECR"
                sh ('$get_authenticate') \
                 ... (rest of code)
                }

Getting me back an error : Unknown options: |,docker,login,--username,AWS,--password-stdin,77777790668.dkr.ecr.us-east-1.amazonaws.com

When using double quotes: "${get_authenticate}" the code works, however this will be insecure and against the documentation.

Anyone know how to solve this puzzle?

bashjenkinsjenkins-pipeline


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