Add timeout for build

- Build may hung up so timeout after 15min
- Relates #2

Author: jvalkeal

.github/workflows/continuous-integration.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   build:
+    timeout-minutes: 15
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false