Run tests with PHP8 on GitHub Actions

.github/workflows/unit_tests.yml

@@ -24,6 +24,17 @@ jobs:
     - name: Unit tests with Sqlite
       run: ./vendor/bin/phpunit -c tests/units.sqlite.xml
 
+  Sqlite-PHP8:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v3
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-suggest
+    - name: Unit tests with Sqlite
+      run: ./vendor/bin/phpunit -c tests/units.sqlite.xml
+
   Postgres:
     runs-on: ubuntu-latest
     container: