try to install redis

Author: ktoso

.github/workflows/pull_request.yml

@@ -15,7 +15,7 @@ jobs:
     name: Unit tests
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      linux_pre_build_command: apt-get update -y && apt-get install redis
+      linux_pre_build_command: apt-get update -y && apt-get install redis -y
       swift_flags:
       linux_env_vars: REDIS_URL=redis
       enable_windows_checks: false