GitLab CI template is outdated (Node.js 12, Yarn, old DB versions)

[ryudoawaru]

Problem

templates/gitlab-ci.yml.erb has several outdated references:

• Node.js 12.13.1 and Yarn installation for non-API apps — Rails 8+ uses importmap by default, no Node/Yarn needed
• yarn-audit job — irrelevant for importmap-based apps
• yarn.lock cache — no longer applicable
• BUNDLER_VERSION: 2.2.26 — very outdated
• postgres:12-alpine — should be updated (e.g. 16 or 17)
• mysql:5.7 — should be updated (e.g. 8.0+)

Location

• templates/gitlab-ci.yml.erb

Fix

• Remove Node.js/Yarn related steps and jobs for importmap-based apps
• Update database service image versions
• Update or remove the hardcoded BUNDLER_VERSION

Affected versions

Rails 7.1+