Fix runtime GIS uploads for operator QA

scripts/train_operator_yolo_detector.sh

@@ -21,7 +21,8 @@ Environment variables:
   TRAIN_BATCH                  Batch size. Default: 2
   TRAIN_WORKERS                Data-loader workers. Default: 0
   TRAIN_DEVICE                 Device passed to Ultralytics. Default: cpu
-  PYTHON_BIN                   Python executable. Default: python3
+  PYTHON_BIN                   Python executable. Default: /opt/geointel/venv/bin/python
+                               when present, otherwise python3.
 
 This helper is an operator/runtime smoke wrapper. It requires an existing local
 base model and an existing local dataset.yaml. It does not create app features.
@@ -43,7 +44,13 @@ TRAIN_IMGSZ="${TRAIN_IMGSZ:-512}"
 TRAIN_BATCH="${TRAIN_BATCH:-2}"
 TRAIN_WORKERS="${TRAIN_WORKERS:-0}"
 TRAIN_DEVICE="${TRAIN_DEVICE:-cpu}"
-PYTHON_BIN="${PYTHON_BIN:-python3}"
+if [[ -z "${PYTHON_BIN:-}" ]]; then
+  if [[ -x "/opt/geointel/venv/bin/python" ]]; then
+    PYTHON_BIN="/opt/geointel/venv/bin/python"
+  else
+    PYTHON_BIN="python3"
+  fi
+fi
 
 DATASET_YAML="${OPERATOR_YOLO_DATASET_DIR%/}/dataset.yaml"
 SUMMARY_PATH="${TRAIN_OUTPUT_DIR%/}/${TRAIN_RUN_NAME}/training_summary.json"