CI: add po generation

.github/workflows/update-translations.yml

@@ -0,0 +1,35 @@
+name: Update po files
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  update-po-files:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the
+      # added or changed files to the repository.
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Sphinx
+        run: sudo apt-get install -y python3-sphinx python3-pip
+
+      - name: Install Sphinx deps
+        run: pip install -r requirements.txt
+
+      - name: Update po files
+        id: update-po
+        run: |
+          make gettext
+          sphinx-intl update -p _build/gettext -l it
+
+      # Commit all changed files back to the repository
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Update po files