triggerOnly.json

{
    "$connections": {
        "value": {
            "azureeventgrid_1": {
                "connectionId": "",
                "id": "/subscriptions/{0}/providers/Microsoft.Web/locations/{1}/managedApis/azureeventgrid"
            }
        }
    },
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {},
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {
            "$connections": {
                "defaultValue": {},
                "type": "Object"
            }
        },
        "triggers": {
            "When_a_resource_event_occurs": {
                "inputs": {
                    "body": {
                        "properties": {
                            "destination": {
                                "endpointType": "webhook",
                                "properties": {
                                    "endpointUrl": "@{listCallbackUrl()}"
                                }
                            },
                            "filter": {
                                "subjectEndsWith": ".jpg"
                            },
                            "topic": "null"
                        }
                    },
                    "host": {
                        "connection": {
                            "name": "@parameters('$connections')['azureeventgrid_1']['connectionId']"
                        }
                    },
                    "path": "/subscriptions//providers/@{encodeURIComponent('Microsoft.Storage.StorageAccounts')}/resource/eventSubscriptions",
                    "queries": {
                        "x-ms-api-version": "2017-09-15-preview"
                    }
                },
                "splitOn": "@triggerBody()",
                "type": "ApiConnectionWebhook"
            }
        }
    }
}