authorizationStrategy: unsecured still wants me to create an admin user

I’m running a throwaway instance of Jenkins in a Docker container on a machine that’s only accessible to people who in principle would all have admin privileges anyway.

I’ve tried copying the configuration from UnsecuredAuthorizationStrategyConfiguratorTest.yml, but when I navigate to Jenkins the first thing I get is a prompt to create an admin user. Full jenkins.yaml:

plugins:
  required:
    blueocean: 1.13.1
    configuration-as-code: 1.7

jenkins:
  systemMessage: |
    Jenkins Docker image built from https://github.com/dmolesUC3/mrt-jenkins-docker
  mode: NORMAL
  numExecutors: 2
  scmCheckoutRetryCount: 2
  securityRealm:
    local:
      allowsSignup: false
  authorizationStrategy: unsecured

I tried

  securityRealm: none

but that just got me

java.lang.IllegalArgumentException: No hudson.security.SecurityRealm implementation found for none
Possible solution: Try to install 'configuration-as-code-support' plugin
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.findDescribableBySymbol(HeteroDescribableConfigurator.java:148)

What am I missing?

System information

• Jenkins 2.150.3 (jenkins/jenkins:lts Docker image)
• configuration-as-code version 1.7
• macOS (as Docker host)

[jetersen]

I suggest your read the readme located here for some of the docker tips: https://github.com/jenkinsci/docker

[jetersen]

To skip setup wizard, add this to your dockerfile.

ARG jenkins_home=/usr/share/jenkins/ref
RUN echo $JENKINS_VERSION | tee \
    $jenkins_home/jenkins.install.UpgradeWizard.state \
    $jenkins_home/jenkins.install.InstallUtil.lastExecVersion

Read the initial exception you posted again, it clearly tells you the solution.