fix: Fix Docker Compose healthcheck

[rolodato]

Fixes #5197.

Docker Compose depends_on with condition: service_healthy only looks at the healthcheck defined in Compose, and not the HEALTHCHECK defined in the Dockerfile.

Several alternatives to fix this:

• Duplicate the current HEALTHCHECK into healthcheck
• Remove the current HEALTHCHECK and only use healthcheck
• Ignore health in Docker Compose and only use startup dependencies. I chose this since it avoids duplicating healthcheck logic while still letting us detect container health outside of Compose, and it's closer to how production-ready deployments work (e.g. Kubernetes, which doesn't let you specify service dependencies by design)

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Mar 7, 2025 4:08pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Mar 7, 2025 4:08pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Mar 7, 2025 4:08pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5198	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5198	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5198	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5198	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5198	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5198	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-61655 was deleted.