test(ci): exercise OpenResty LuaJIT in Lua matrix

[membphis]

Summary

• Refactor the lua CI job into an upstream LuaJIT / OpenResty LuaJIT matrix.
• Install LuaJIT with leafo/gh-actions-lua, install busted and lua-cjson with LuaRocks, and run tests/lua with LD_LIBRARY_PATH pointed at the release cdylib.
• Keep LuaRocks package validation on the upstream LuaJIT dimension and note the CI coverage change in the changelog.

Closes #83

Test Plan

• /tmp/lua-qjson-actionlint-bin/actionlint .github/workflows/ci.yml
• eval "$(luarocks --lua-version=5.1 path)" && export PATH="$HOME/.luarocks/bin:$PATH" && export LUA_CPATH="./target/release/lib?.dylib;./target/release/?.dylib;./target/release/lib?.so;./target/release/?.so;$LUA_CPATH" && make build && LD_LIBRARY_PATH=./target/release DYLD_LIBRARY_PATH=./target/release busted --lua=$(command -v luajit) tests/lua --lpath='./lua/?.lua'
• make lint

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 353a7542-29be-42fd-9e91-4ca1265d75c4

📥 Commits

Reviewing files that changed from the base of the PR and between 074ff2b and e20da10.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-83-openresty-luajit-ci

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