Add CI config for crowdin action

.github/workflows/l18n-crowdin.yml

@@ -0,0 +1,35 @@
+name: Sync crowdin translation
+
+on:
+  push:
+    paths: # run action automatically when app_en.arb file is changed
+      - 'lib/l10n/arb/app_en.arb'
+    branches: [ main ]
+  schedule:
+    - cron: '0 */12 * * *' # Every 12 hours - https://crontab.guru/#0_*/12_*_*_*
+  workflow_dispatch: # for manually running the action
+
+jobs:
+  synchronize-with-crowdin:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: crowdin action
+        uses: crowdin/github-action@v1
+        with:
+          upload_sources: true
+          upload_translations: true
+          download_translations: true
+          localization_branch_name: l10n_translations
+          create_pull_request: true
+          skip_untranslated_strings: true
+          pull_request_title: 'New Translations'
+          pull_request_body: 'New translations via [Crowdin GH Action](https://github.com/crowdin/github-action)'
+          pull_request_base_branch_name: 'main'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+          CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}