Use GITHUB_ACCESS_TOKEN in Jenkins inside docker for authentication - jenkins

Question

I've followed the solution provided by #biolauri in this post, in using GITHUB_ACCESS_TOKEN in Jenkins inside a docker container. Below is my stage code:
stage('Push git tag') {
agent { label 'docker' }
steps {
script {
try {
container = docker.build("git", "-f git.dockerfile .")
container.inside {
withCredentials([usernamePassword(
credentialsId: "<credential-name-stored-in-jenkins>",
usernameVariable: "GITHUB_APP",
passwordVariable: "GITHUB_ACCESS_TOKEN")]) {
withEnv(["GITHUB_TOKEN=$GITHUB_ACCESS_TOKEN"]) {
sh "git tag ${version_g}"
sh "git push origin ${version_g}"
}
}
}
} catch (Exception e) {
// sh "git tag -d ${version_g} || true"
throw e
}
}
}
}
But I am still getting this error:
fatal: could not read Username for 'https://github.com': No such
device or address
What am I doing wrong here?
Just to make sure that I am getting the correct Github App ID, I actually echoed it and it is indeed the correct Github App ID. And I also echoed the generated GITHUB_ACCESS_TOKEN, and it indeed looks like a generated token. But the docker image built seems to be not recognizing the GITHUB_TOKEN environment variable set, to be able to do a git push