zulip/docker-zulip 12.0-0

Zulip Server 12.0-0

on GitHub

Initial release of the new server image lineage published at
ghcr.io/zulip/zulip-server. High-level changes accumulated
across the 11.x series:

• Update to Zulip Server 12.0.
• Image is now published to ghcr.io/zulip/zulip-server with
  multi-architecture (linux/amd64 and linux/arm64) manifests
  built in parallel.
• Modernized Docker Compose layout: renamed to compose.yaml,
  introduced compose.override.yaml for local settings
• Switched secret management to Docker secrets.
• Added a Dockerfile HEALTHCHECK.
• Reworked TLS / certificate handling: HTTP-only serving is now
  the default, and certbot issuance works again, and certificates
  are stored under /data/certs/ so auto-generated certs can no
  longer overwrite manually-provided ones.
• Surface entrypoint and server errors via docker logs.
• Removed the majority of the custom-named environment variables,
  instead relying on generalized SETTING_ and CONFIG_ variables.
• Reworked app:backup and app:restore to use binary
  pg_dumps and to handle custom PostgreSQL passwords.
• Added a manage.py wrapper script at the repository root.
• Added a dedicated documentation site at
  zulip.readthedocs.io/projects/docker.
• Relocated the in-tree Helm chart from kubernetes/chart/zulip/
  to helm/zulip/, and removed the unmaintained
  kubernetes/manual/ deployments.