Workflow stuck with concurrency value of 0.

[nzlosh]

Orquesta workflow

If a workflow is defined with a concurrency of 0, Orquesta will remain in a running blocked state.

meta

---
name: count_loop
pack: test
description: Count the number of with items executed using concurrency 1.
runner_type: orquesta
entry_point: "workflows/count_loop.yaml"
enabled: true
parameters:
  iterations:
    type: integer
    default: 5

workflow

version: 1.0

input:
  - iterations

tasks:
  display_message:
    with:
      items: <% range(ctx(iterations)) %>
      concurrency: 0
    action: core.local
    input:
      cmd: "echo <% item() %> ; sleep 2"

Actual result

# st2 execution get 653780da88bb8d51b229d4c0                                                                                                            
id: 653780da88bb8d51b229d4c0                                                                                                                                        
action.ref: test.count_loop                                                                                                                                         
parameters:                                                                                                                                                         
  iterations: 10                                                                                                                                                    
status: running (21s elapsed)                                                                                                                                       
start_timestamp: Tue, 24 Oct 2023 08:31:22 UTC                                                                                                                      
end_timestamp:                                                                                                                                                      
log:                                                                                                                                                                
  - status: requested                                                                                                                                               
    timestamp: '2023-10-24T08:31:22.178000Z'                                                                                                                        
  - status: scheduled                                                                                                                                               
    timestamp: '2023-10-24T08:31:22.229000Z'                                                                                                                        
  - status: running                                                                                                                                                 
    timestamp: '2023-10-24T08:31:22.272000Z'                                                                                                                        
result:                                                                                                                                                                                           
  output: null

Expected result

In the case of negative numbers, Orquesta raises an error. `0` should also be classed as an error like negative numbers.

# st2 execution get 653788d088bb8d51b229d4c9
id: 653788d088bb8d51b229d4c9
action.ref: test.count_loop
parameters: 
  iterations: 10
status: failed (0s elapsed)
start_timestamp: Tue, 24 Oct 2023 09:05:20 UTC
end_timestamp: Tue, 24 Oct 2023 09:05:20 UTC
log: 
  - status: requested
    timestamp: '2023-10-24T09:05:20.688000Z'
  - status: scheduled
    timestamp: '2023-10-24T09:05:20.741000Z'
  - status: running
    timestamp: '2023-10-24T09:05:20.786000Z'
  - status: failed
    timestamp: '2023-10-24T09:05:20.845000Z'
result: 
  errors:
  - message: -1 is not valid under any of the given schemas
    schema_path: properties.tasks.patternProperties.^\w+$.properties.with.properties.concurrency.oneOf
    spec_path: tasks.display_message.with.concurrency
    type: syntax
  output: null