Run CKAN upload weekly on airflow

[machow]

TODO:

• Run the script in services/gtfs-ckan-uploader on our kubernetes cluster used for RT download (or one with enough RAM to get this thing airborn).
• Use or modify our pod_operator to trigger running it

[hunterowens]

This is blocked by the CKAN api limit on multiGB uploads.

[holly-g]

Should be resolved; new version of CKAN was deployed.

[themightychris]

Let's make sure catchup is disabled on this airflow DAG if we're just updating a single dataset with the latest

[lauriemerrell]

Just to note -- it looks like the CKAN reports are driven off the latest-only data in gtfs_schedule:

I am refactoring this data in #1157. We may want to touch base on whether the report content needs to be reevaluated at all. (My refactor does not change the substance of that data, but as part of my refactor I have noticed that most places that were consuming this data were possibly doing so incorrectly and there may be other datasets that better suit the needs. So I wanted to flag that for CKAN as well.)