Add workflow to pull upstream changes when id/messages.po is updated

.github/workflows/get-upstream-changes-I10n-id.yml

@@ -0,0 +1,18 @@
+name: pull upstream changes for new untranslated strings (ID)
+on: [push]
+jobs:
+  pull-new-strings:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - run: |
+          git remote add upstream https://github.com/kodebanget/bsky-social-app.git
+          git fetch upstream main
+          FILE_IS_UPDATED=$(git diff --compact-summary main upstream/main | grep 'id/messages.po')
+          echo $FILE_IS_UPDATED
+          if [ "$FILE_IS_UPDATED" != "" ]; then
+            git merge upstream/main
+            git push origin main
+          fi