Trying to use docker.withRegistry results in:

Failed to initialize: unable to resolve docker endpoint: context "rootless": context not found: open /var/lib/jenkins/workspace/r_PROJECT_NAME_master@tmp/a5534a4f-0526-4110-af60-6d9dcc324f14/contexts/meta/12b961af5feb3e9d39f93b2cefb9a1a944f18d02cca0cac2f04f5a982240605f/meta.json: no such file or directory

I'm trying to run rootless docker, but AFAIK the issue is with running a non-default context. It should be looking in /var/lib/jenkins/.docker/contexts/meta rather than in workspace.

$ docker context inspect rootless
[
    {
        "Name": "rootless",
        "Metadata": {
            "Description": "Rootless mode"
        },
        "Endpoints": {
            "docker": {
                "Host": "unix:///run/user/102/docker.sock",
                "SkipTLSVerify": false

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}}
        },
        "TLSMaterial": {},
        "Storage": {
            "MetadataPath": "/var/lib/jenkins/.docker/contexts/meta/12b961af5feb3e9d39f93b2cefb9a1a944f18d02cca0cac2f04f5a982240605f",
            "TLSPath": "/var/lib/jenkins/.docker/contexts/tls/12b961af5feb3e9d39f93b2cefb9a1a944f18d02cca0cac2f04f5a982240605f"

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]