in lib/jenkinsfile_runner/commands/init.rb [109:125]
def create_ignore_files
content = <<~EOF
**/*.log
jenkins_home/jobs
jenkins_home/logs
**/*.key
**/*.key.enc
jenkins_home/secrets
jenkins_home/userContent
jenkins_home/users
EOF
create_file('.gitignore') { content }
create_file('.dockerignore') { content }
end