fix: add health check to get rid of the downtime between deployments

[okunamayanad]

Pull Request

Description

Adds HEALTHCHECK operation to dockerfile to assure Docker does not mark the container as healthy until Next boots up and starts serving the site.

This also:

• gets rid of the downtime between deployments as Dokploy will now keep the old container running until the new container is healthy
• fixes the bug where Cloudflare's edge cache breaks if it gets timed just right and hits the site when it's partly down as Next is booting up.

Type of Change

• Documentation fix (typo, grammar, clarification)
• New documentation (guide, tutorial, page)
• Bug fix
• New feature
• Other

Screenshots

If applicable, add before/after screenshots:

Checklist

• Tested locally with bun run dev
• Formatted code to adhere Styleguide with bun format
• Ran bun audit (no critical vulnerabilities)
• Checked spelling and grammar
• Verified all links work
• Followed Contributing Guidelines

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Thank you for contributing!