try to install redis

Author: ktoso

.github/workflows/pull_request.yml

@@ -13,4 +13,9 @@ jobs:
 
   unit-tests:
     name: Unit tests
-    uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+    uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+    with:
+      linux_pre_build_command: apt-get update -y && apt-get install redis
+      swift_flags:
+      linux_env_vars: REDIS_URL=redis
+      enable_windows_checks: false