Merge pull request #4247 from masatake/gha--timeout

GitHub Actions: set timeout to tests on Qemu

Author: masatake

.github/workflows/testing-on-alpine.yml

@@ -46,6 +46,8 @@ jobs:
       matrix:
         target-arch: [loongarch64, aarch64, ppc64le, riscv64, s390x]
 
+    timeout-minutes: 45
+
     steps:
       - uses: actions/checkout@v4