fix(airflow): dag and docker with Variable and apache-airflow

Author: vancauwe

src/airflow/src/airflow_inference.py

@@ -2,6 +2,8 @@
 import logging
 import os
 
+from airflow.models import Variable
+
 BASE_URL = os.getenv('INFERENCE_URL')
 NEO4J_DB = os.getenv('NEO4J_DATABASE')
 API_TOKEN = os.getenv('API_TOKEN')

tools/images/Dockerfile-airflow

@@ -2,7 +2,9 @@ FROM python:3.9-slim
 
 WORKDIR /app
 
-RUN pip install --no-cache-dir requests
+RUN pip install --no-cache-dir "apache-airflow==2.9.1" \
+    --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-2.9.1/constraints-3.9.txt" \
+    requests
 
 COPY ../../src/airflow/src/airflow_inference.py .