[CI] Add support for GitHub Actions

Author: shahmishal

.github/workflows/pull_request.yml

@@ -0,0 +1,13 @@
+name: pull_request
+
+on:
+    pull_request:
+      types: [opened, reopened, synchronize]
+
+jobs:
+   tests:
+        name: tests
+        uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+        with:
+          exclude_swift_versions: "[{\"swift_version\": \"5.8\"}]"
+          pre_build_command: "apt-get update -y -q && apt-get install -y -q default-jdk"