Initialize airflow variables on docker creation.

[jimk-bdrc]

I want the list of directories that feed scans to be an airflow variable.

Github copilot starts with this approach.

To initialize Airflow variables when running in a Docker container, you can use the Airflow CLI within the container. Here is a step-by-step guide:

1. Create a JSON file with the variables you want to initialize. For example, variables.json:

   {
     "key1": "value1",
     "key2": "value2"
   }

2. Copy the JSON file into the Docker container. You can do this using the docker cp command:

   docker cp variables.json <container_id>:/path/to/variables.json

3. Use the Airflow CLI to import the variables from the JSON file. Execute the following command inside the container:

   docker exec -it <container_id> airflow variables import /path/to/variables.json

Here is a complete example:

1. Create variables.json:

   {
     "key1": "value1",
     "key2": "value2"
   }

2. Copy the file into the container:

   docker cp variables.json <container_id>:/opt/airflow/variables.json

3. Import the variables using the Airflow CLI:

   docker exec -it <container_id> airflow variables import /opt/airflow/variables.json

Replace <container_id> with the actual ID of your Airflow container. This will initialize the Airflow variables from the JSON file.