CI: add build feed workflow

.github/workflows/build-feeds.yml

@@ -0,0 +1,46 @@
+name: Build RSS feeds
+
+on:
+  schedule:
+    - cron: "0 6 * * *" # Runs once per day at 06:00 UTC
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install sparqlwrapper feedgen lxml
+
+      - name: Generate feeds
+        run: |
+          python resspublica/main.py
+
+      - name: Commit and push changes
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+          git add feed/
+
+          if git diff --cached --quiet; then
+            echo "No changes to commit"
+            exit 0
+          fi
+
+          git commit -m "feeds: update $(date -u +%Y-%m-%d)"
+          git push origin main