Add CI/CD workflow

.github/workflows/build.yml

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+name: Build
+
+on:
+  workflow_call:
+    inputs:
+      version:
+        description: 'Version to embed in binary'
+        required: false
+        type: string
+        default: 'dev'
+      upload-artifacts:
+        description: 'Upload build artifacts'
+        required: false
+        type: boolean
+        default: true
+      retention-days:
+        description: 'Artifact retention days'
+        required: false
+        type: number
+        default: 1
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to embed in binary'
+        required: false
+        type: string
+        default: 'dev'
+      upload-artifacts:
+        description: 'Upload build artifacts'
+        required: false
+        type: boolean
+        default: true
+      retention-days:
+        description: 'Artifact retention days'
+        required: false
+        type: number
+        default: 1
+
+jobs:
+  build:
+    name: Build ${{ matrix.goos }}-${{ matrix.goarch }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - goos: linux
+            goarch: amd64
+          - goos: linux
+            goarch: arm64
+          - goos: darwin
+            goarch: amd64
+          - goos: darwin
+            goarch: arm64
+          - goos: windows
+            goarch: amd64
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.25.1'
+          cache: true
+
+      - name: Build binary
+        env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+          CGO_ENABLED: 0
+        run: |
+          # Set binary name
+          VERSION="${{ inputs.version }}"
+          EXT=""
+          [ "$GOOS" = "windows" ] && EXT=".exe"
+          BINARY_NAME="sym-$GOOS-$GOARCH$EXT"
+
+          # Build
+          go build \
+            -ldflags "-s -w -X main.Version=$VERSION" \
+            -trimpath \
+            -o "$BINARY_NAME" \
+            ./cmd/sym
+
+          echo "Built $BINARY_NAME"
+
+      - name: Upload artifact
+        if: inputs.upload-artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: sym-${{ matrix.goos }}-${{ matrix.goarch }}
+          path: sym-${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.goos == 'windows' && '.exe' || '' }}
+          if-no-files-found: error
+          retention-days: ${{ inputs.retention-days }}

.github/workflows/ci.yml

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+name: CI
+
+on:
+  schedule:
+    # 매일 한국 시간 오전 9시 (UTC 0시)
+    - cron: '0 0 * * *'
+  pull_request:
+    branches:
+      - main
+  workflow_call:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: read
+  actions: write
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.25.1'
+          cache: true
+
+      - name: Run go vet
+        run: go vet ./...
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v7
+        with:
+          version: v2.4.0
+          args: --timeout=5m
+
+  test:
+    name: Unit Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.25.1'
+          cache: true
+
+      - name: Download dependencies
+        run: go mod download
+
+      - name: Verify dependencies
+        run: go mod verify
+
+      - name: Run tests
+        run: go test -short -v -race -coverprofile=coverage.out -covermode=atomic ./...
+
+      - name: Generate coverage report
+        run: go tool cover -html=coverage.out -o coverage.html
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: |
+            coverage.out
+            coverage.html
+          retention-days: 1
+
+  build:
+    name: Build
+    needs: [lint, test]
+    uses: ./.github/workflows/build.yml
+    with:
+      version: 'ci-build'
+      upload-artifacts: false