Add GHA workflow to build OTA updates

.github/workflows/build-ota-updates.yml

@@ -0,0 +1,37 @@
+name: OTA translations
+
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    # Every day at 10:11 UTC
+    - cron:  '11 10 * * *'
+
+jobs:
+  build-ota-translations:
+    name: Build OTA translations
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install GNU gettext
+      run: sudo apt-get install gettext
+
+    - name: Install Crowdin CLI
+      run: npm i -g @crowdin/cli
+
+    - name: Download latest translations from Crowdin
+      run: |
+        echo 'api_token: "${{secrets.CROWDIN_PERSONAL_TOKEN}}"' >>crowdin.yaml
+        crowdin download
+        rm crowdin.yaml
+
+    - name: Build OTA updates
+      run: scripts/build-ota-translations.sh
+
+    - name: Upload OTA updates
+      run: |
+        VERSION=$(sed -n -e 's/.*POEDIT_VERSION.* "\([0-9]*\)\.\([0-9]*\).*".*/\1.\2/p' src/version.h)
+        echo "OTA version: $VERSION"
+        curl --fail-with-body -F '[email protected]' -H "X-Api-Key: ${{secrets.OTA_API_KEY}}" "${{secrets.OTA_UPLOAD_ENDPOINT}}?version=${VERSION}"