Test grantlee5 plugin properly

Author: TheAssassin

.github/workflows/main.yml

@@ -10,6 +10,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - name: Install dependencies
+      run: sudo apt-get install -y libgrantlee5-dev
+
     - name: Lint test script
       run: shellcheck ./tests/test-plugins.sh