ci: release.yml 동작 수정 및 package.json publish never 설정

release.yml:
- setup-node cache: 'npm' 추가로 설치 속도 향상
- CSC_IDENTITY_AUTO_DISCOVERY=false: code signing 없이 DMG 빌드 가능
- List dist 단계 추가 (디버깅용)
- softprops/action-gh-release token 명시, files 멀티라인 형식
package.json:
- build.publish: "never" 추가 (electron-builder 자체 auto-publish 방지)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -15,16 +15,22 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20.x'
+          cache: 'npm'
 
       - name: Install dependencies
         run: npm ci
 
       - name: Build
         run: npm run build
+        env:
+          CSC_IDENTITY_AUTO_DISCOVERY: "false"
+
+      - name: List dist
+        run: ls -lh dist/
 
       - name: Upload DMG assets
         uses: softprops/action-gh-release@v2
         with:
-          files: dist/*.dmg
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          files: |
+            dist/*.dmg

package.json

@@ -103,6 +103,7 @@
     "directories": {
       "buildResources": "resources",
       "output": "dist"
-    }
+    },
+    "publish": "never"
   }
 }