Setup Crowdin sync via GitHub Actions

.github/workflows/crowdin.yml

@@ -0,0 +1,34 @@
+name: Crowdin
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+
+  synchronize-with-crowdin:
+    name: Synchronize with Crowdin
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Sync Translations
+      uses: crowdin/github-action@1.4.12
+      with:
+        upload_sources: true
+        upload_translations: true
+        download_translations: true
+        localization_branch_name: 12.1-dev-localization
+        create_pull_request: true
+        base_url: 'https://lawnchair.crowdin.com'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}
+        CROWDIN_PERSONAL_TOKEN: ${{ secrets.CROWDIN_PERSONAL_TOKEN }}

crowdin.yml

@@ -1,3 +1,5 @@
+project_id_env: CROWDIN_PROJECT_ID
+api_token_env: CROWDIN_PERSONAL_TOKEN
 files:
   - source: /lawnchair/res/values/strings.xml
     translation: /lawnchair/res/values-%android_code%/%original_file_name%