Add expiration field to DataRun model

[glass-ships]

Short description of the changes:

Add expiration_date field to DataRun model in order to flag for occasional deletion after some amount of time (3 years by default, can adjust later)

Long description of the changes:

• Add expiration_date field to DataRun
• Add purge_expired_data admin command
• Add a migration for model update
• Add logic to handle expiration_date (as a python datetime) in upload_plot_data and upload_user_data endpoints
  • also gets passed/handled by get_or_create_run() helper function, as well as store_user/plot_data
• Added a get_all_runs endpoint for utility, which includes expiration_date and expired (bool) fields
• Add tests for new functionality
• Add documentation for updating data models and migrating database

Additionally:

• Update existing test for clarity in reading
• Add dependabot.yml to check for updates to actions
• Updates test workflow with changes to github's docker version
• Add useful entries to .gitignore
• Add a check for appropriate docker compose command in Makefile
• Add a make clean target
• Some minor formatting changes

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT] (N/A)
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

EWM Story 4887

[codecov]

Codecov Report

Attention: Patch coverage is 88.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 86.75%. Comparing base (3dec7ee) to head (5e67172).
Report is 4 commits behind head on next.

Files	Patch %	Lines
...r/plots/migrations/0002_datarun_expiration_date.py	0.00%	5 Missing ⚠️
src/live_data_server/live_data_server/settings.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #25      +/-   ##
==========================================
- Coverage   86.87%   86.75%   -0.13%     
==========================================
  Files          10       12       +2     
  Lines         282      317      +35     
==========================================
+ Hits          245      275      +30     
- Misses         37       42       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[backmari]

Can you please change the relative imports back to absolute, mostly for clarity and consistency?