Log cleanup DAG

[zackkrida]

Fixes

Fixes WordPress/openverse#1751 by @mathemancer

Description

This PR creates a simple DAG to delete log files from the local airflow filesystem. The DAG runs daily. It checks the date of files in the airflow base log directory (in our case /usr/local/airflow/logs) and deletes everything created X days ago.

This, paired with our new remote logging (#136), eliminates the need to manually delete airflow logs and worry about the scary-sounding work outlined here. We can delete that document after merging (or simply mark it deprecated/private).

Improvements are welcomed, encouraged, and needed! All I really did was copy/paste and test, I don't currently have the bandwidth to improve this further. It'd be great for the code style to be cleaned and altered to match the rest of the repository.

Technical details

This DAG was copied from https://github.com/teamclairvoyant/airflow-maintenance-dags/blob/master/log-cleanup/airflow-log-cleanup.py, the only edits made were to the default parameters.

Tests

If you'd like to test, you can do so locally by creating some random files in the log directory, and doing a manual DAG run with the configuration {"maxLogAgeInDays":-1}.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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