refactor: 모던 C# 관례 적용 및 테스트 보강 #9

	name: Build, Test, and Publish NuGet Package

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build-and-publish:
	runs-on: ubuntu-latest

	permissions:
	contents: read
	id-token: write # Trusted Publishing용 GitHub OIDC 토큰 발급 허용

	steps:
	- name: Checkout repository
	uses: actions/checkout@v7

	- name: Setup .NET
	uses: actions/setup-dotnet@v5
	with:
	dotnet-version: '8.0.x'

	- name: Restore dependencies
	run: dotnet restore

	- name: Build
	run: dotnet build --configuration Release --no-restore

	- name: Test
	run: dotnet test --configuration Release --no-build --verbosity normal

	- name: Pack
	run: dotnet pack --configuration Release --no-build --output ./nupkg

	# Trusted Publishing: OIDC 토큰을 1시간짜리 임시 API 키로 교환
	# (nuget.org -> 계정 -> Trusted Publishing 정책 등록 필요)
	- name: NuGet login (OIDC -> temp API key)
	if: github.ref == 'refs/heads/main'
	uses: NuGet/login@v1
	id: login
	with:
	user: JaejoonHan # nuget.org 프로필명

	- name: Publish to NuGet
	if: github.ref == 'refs/heads/main' # main 브랜치에서만 배포
	run: dotnet nuget push ./nupkg/*.nupkg --api-key ${{ steps.login.outputs.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate

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