ci: set a CI timeout

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

.github/workflows/ci.yml

@@ -45,6 +45,7 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
       - name: Check out
         uses: actions/checkout@v2
@@ -79,4 +80,3 @@ jobs:
       - name: Integration test
         run: |
           make integration
-