Docker update

[SchrodingersGat]

• Simplify docker setup procedure
• Now uses a pre-baked custom Caddy container
• Closes https://github.com/inventree/InvenTree/issues/6920
• Ref: https://github.com/inventree/inventree-caddy
• Ref: https://hub.docker.com/r/inventree/inventree-caddy

[netlify[bot]]

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