Add default value for cron

Author: b-per

src/dbt_jobs_as_code/schemas/common_types.py

@@ -70,7 +70,7 @@ def serialize(self):
 
 
 class Schedule(BaseModel):
-    cron: str
+    cron: str = "0 0 1 1 *"  # default to once a year
     date: Optional[Date] = None
     time: Optional[Time] = None
 

src/dbt_jobs_as_code/schemas/load_job_schema.json

@@ -339,6 +339,7 @@
     "Schedule": {
       "properties": {
         "cron": {
+          "default": "0 0 1 1 *",
           "title": "Cron",
           "type": "string"
         },
@@ -365,9 +366,6 @@
           "default": null
         }
       },
-      "required": [
-        "cron"
-      ],
       "title": "Schedule",
       "type": "object"
     },