added script to get the bpmn json for a given process instance id w/ burnettk

bin/get_bpmn_json_for_process_instance

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+import os
+import sys
+
+from spiffworkflow_backend import create_app
+from spiffworkflow_backend.models.process_instance import ProcessInstanceModel
+
+
+def main(process_instance_id: str):
+    os.environ["FLASK_ENV"] = "development"
+    flask_env_key = "FLASK_SESSION_SECRET_KEY"
+    os.environ[flask_env_key] = "whatevs"
+    app = create_app()
+    with app.app_context():
+        process_instance = ProcessInstanceModel.query.filter_by(id=process_instance_id).first()
+
+        if not process_instance:
+            raise Exception(f"Could not find a process instance with id: {process_instance_id}")
+
+        with open(f'/tmp/{process_instance_id}_bpmn_json.json', 'w', encoding="utf-8") as f:
+            f.write(process_instance.bpmn_json)
+
+
+if len(sys.argv) < 2:
+    raise Exception("Process instance id not supplied")
+
+main(sys.argv[1])