Fix Docker image to run in healthy mode

Refs https://redmine.teklia.com/issues/6470

• Use django-admin in Docker for easier deployments, as it's easier to setup worker commands or any other django-admin command than relying on ./manage.py
• Update healthcheck to verify /api/v1/corpus instead of /api/v1/public-key that is dependant on ponos
• Use $PORT in dockerfile
• Use arkindex script in dockerfile
• Warn on usage of ./manage.py
• Expose arkindex for developers too

requested review from @erouchet

assigned to @babadie

added 1 commit

• c5856d53 - Update healthcheck

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changed title from Use django-admin in Docker for easier deployments to Fix Docker image to run in healthy mode

changed the description

@erouchet please review this one today, it blocks preprod deployment

added 2 commits

• d3cfc458 - Fix healthcheck
• 3810b83b - Use arkindex entrypoint

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changed the description

@erouchet I updated the MR to make arkindex available

added 1 commit

• b6d81dd3 - Obliterate manage.py

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enabled an automatic merge when the pipeline for b6d81dd3 succeeds

merged