D:\a\auth0-oidc-client-net\auth0-oidc-client-net\./.github/actions/nuget-publish\action.yml (Line: 26, Col: 7): Required property is missing: shell

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. D:\a\auth0-oidc-client-net\auth0-oidc-client-net\./.github/actions/nuget-publish\action.yml (Line: 26, Col: 7): Required property is missing: shell at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check() at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)

Failed to load D:\a\auth0-oidc-client-net\auth0-oidc-client-net\./.github/actions/nuget-publish\action.yml