set timeout to 15 minutes

Author: IanButterworth

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
     strategy:
       fail-fast: false
       matrix: