hathitrust/github_actions/action-updates/build/action.yml (Line: 116, Col: 13): Unexpected symbol: '['. Located at position 24 within expression: inputs.img_tag && join([inputs.image, inputs.img_tag],':') || inputs.image

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. hathitrust/github_actions/action-updates/build/action.yml (Line: 116, Col: 13): Unexpected symbol: '['. Located at position 24 within expression: inputs.img_tag && join([inputs.image, inputs.img_tag],':') || inputs.image 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)