fix(ci): configure a git identity so the suite passes on a bare runner - #13

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'path' is defined but never used. Allowed unused vars must match /^_/u

'TARGETS' is defined but never used. Allowed unused vars must match /^_/u

'writeConfig' is defined but never used. Allowed unused vars must match /^_/u

'skillName' is assigned a value but never used. Allowed unused vars must match /^_/u

'slugify' is defined but never used. Allowed unused vars must match /^_/u

'path' is defined but never used. Allowed unused vars must match /^_/u

'path' is defined but never used. Allowed unused vars must match /^_/u

'path' is defined but never used. Allowed unused vars must match /^_/u

'warn' is defined but never used. Allowed unused vars must match /^_/u