Add PostgreSQL 18 support

[Copilot]

Adds PG18 as the new default, upgrading from PG17. Requires Alpine 3.22 (available in hassio-addons/base v18.x) since PG18 packages aren't in Alpine 3.21.

Base image

• Bump build.yaml base images from 17.2.5 → 18.2.1 (Alpine 3.21 → 3.22)

Dockerfile

• Add timescale/timescaledb:2.26.0-pg18 FROM stage
• Add FROM stages for all new pg18 pre-built dependencies
• Install postgresql18 (+ jit/dev/contrib) APK packages
• Flip default symlink: /usr/libexec/postgresql → postgresql18
• Update Alpine CDN repo references from v3.21 → v3.22
• Copy all pg18 extensions (PostGIS, TimescaleDB, toolkit, pgAgent, system-stat, pgVector)
• Retain pg16 + pg17 packages/extensions for the upgrade chain

New docker-dependency Dockerfiles

All built against timescale/timescaledb:latest-pg18:

• pgagent-pg18
• postgis-pg18
• timescaledb-toolkit-pg18 (pgrx config updated to pg18)
• postgresql-extension-system-stat-pg18
• pgvector-pg18

Automatic upgrade

Added pg17→pg18 upgrade step in init-addon/run, enabling the full chained upgrade path:

PG16 → PG17 → PG18

Each step runs sequentially via consecutive if checks on PG_VERSION, so users on any supported version upgrade in a single addon restart.

Documentation

Updated .README.j2 version header to reflect PostgreSQL 18, TimescaleDB 2.26.0, and TimescaleDB Toolkit 1.22.0.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• pkgs.alpinelinux.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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