ci: add test for sync_files (quisquous#5368)

Fixes quisquous#5221

.github/workflows/test-sync-files.yml

@@ -0,0 +1,26 @@
+name: Sync Files Test
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'ui/raidboss/**'
+      - '.github/workflows/test-sync-files.yml'
+      - 'package.json'
+  pull_request:
+    paths:
+      - 'ui/raidboss/**'
+      - '.github/workflows/test-sync-files.yml'
+      - 'package.json'
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/setup-js-env
+
+      - name: npm run sync-files
+        run: |
+          npm run sync-files

package.json

@@ -31,6 +31,7 @@
     "stylelintfix": "stylelint --fix resources/**/*.css ui/**/*.css user/**/*.css test/**/*.css util/**/*.css",
     "markdownlint": "markdownlint . --ignore node_modules --ignore publish --ignore plugin/ThirdParty",
     "test": "mocha",
+    "sync-files": "ts-node util/sync_files.ts && git diff --exit-code",
     "lint-staged": "lint-staged",
     "coverage-report": "ts-node util/gen_coverage_report.ts",
     "util": "ts-node util/index.ts",