All required checks pass job constantly fails on 3.13 and 3.14

[sobolevn]

Bug report

Link: https://github.com/python/cpython/actions/runs/15042957047/job/42278775691

Error: The template is not valid. .github/workflows/build.yml (Line: 629, Col: 24): Error reading JToken from JsonReader. Path '', line 0, position 0.
##[debug]GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. .github/workflows/build.yml (Line: 629, Col: 24): Error reading JToken from JsonReader. Path '', line 0, position 0.
##[debug]   at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check()
##[debug]   at GitHub.DistributedTask.Pipelines.ObjectTemplating.PipelineTemplateEvaluator.EvaluateStepInputs(TemplateToken token, DictionaryContextData contextData, IList`1 expressionFunctions)
##[debug]   at GitHub.Runner.Worker.ActionRunner.RunAsync()
##[debug]   at GitHub.Runner.Worker.StepsRunner.RunStepAsync(IStep step, CancellationToken jobCancellationToken)
##[debug]Finishing: Check whether the needed jobs succeeded or failed

[picnixz]

cc @AA-Turner I think you changed the detection and Hugo said something on the discord about the detection not knowing between a PR and not a PR (but I'm not sure)

[hugovk]

Looks like this is fixed with the merge of #133671 and backports:

• 3.14 https://github.com/python/cpython/actions/runs/15046451114
• 3.13 https://github.com/python/cpython/actions/runs/15046543766
• 3.12 https://github.com/python/cpython/actions/runs/15047068309

[sobolevn]

Awesome, thank you!