Install system deps in CI

Author: lysnikolaou

.github/workflows/precommit.yaml

@@ -21,6 +21,10 @@ jobs:
         with:
           python-version: "3.x"
           cache: "pip"
+      - name: Install system deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y hunspell hunspell-el gettext language-pack-el locales-all
       - uses: pre-commit/[email protected]
       - uses: pre-commit-ci/[email protected]
         if: always()