Jenkinsfile-runner fails with pipeline as yaml input

[natsen]

Jenkins and plugins versions report

Environment

Paste the output here

What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu

Reproduction steps

1. docker run --rm -v $(pwd)/Jenkinsfile.yml:/workspace/Jenkinsfile.yml jenkins/jenkinsfile-runner
   Jenkinsfile.yml:

pipeline:
  agent:
    none:
  stages:
  - stage: "Print Hello"
    steps:
    - echo "Hello, YAML world!"

Expected Results

Hello, YAML World!

Actual Results

Started
Resume disabled by user, switching to high-performance, low-durability mode.
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
WorkflowScript: 5: expecting EOF, found ':' @ line 5, column 10.
- stage: "Print Hello"
^

1 error

    at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:309)
    at org.codehaus.groovy.control.ErrorCollector.addFatalError(ErrorCollector.java:149)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:119)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:131)
    at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:349)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.transformCSTIntoAST(AntlrParserPlugin.java:225)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:191)
    at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:233)
    at org.codehaus.groovy.control.CompilationUnit$1.call(CompilationUnit.java:189)
    at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:966)
    at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:626)
    at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:602)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:579)
    at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:323)
    at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:293)
    at groovy.lang.GroovyShell.parseClass(GroovyShell.java:677)
    at groovy.lang.GroovyShell.parse(GroovyShell.java:689)
    at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.doParse(CpsGroovyShell.java:142)
    at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.reparse(CpsGroovyShell.java:127)
    at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.parseScript(CpsFlowExecution.java:561)
    at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.start(CpsFlowExecution.java:513)
    at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:335)
    at hudson.model.ResourceController.execute(ResourceController.java:101)
    at hudson.model.Executor.run(Executor.java:442)

Finished: FAILURE

Anything else?

This is reproducible with main branch as well. On debugging the issue

jenkinsfile-runner/payload/src/main/java/io/jenkins/jenkinsfile/runner/PipelineDefinitionProvider.java

Line 38 in 98f3b69

return ExtensionList.lookup(PipelineDefinitionProvider.class);

returns empty list instead of the two implementations it is supposed to return.

I reviewed jenkinsci/pipeline-as-yaml-plugin#28 but this issue happens even before SetJenkinsfileLocation.

[qwertyuiope]

same here