Set JAVA_HOME in pre-build

Author: shahmishal

.github/workflows/pull_request.yml

@@ -10,6 +10,4 @@ jobs:
         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 openjdk-21-jdk"
-        env:
-          JAVA_HOME: "/usr/lib/jvm/java-21-openjdk-amd64"
+          pre_build_command: "apt-get update -y -q && apt-get install -y -q openjdk-21-jdk && export JAVA_HOME=\"/usr/lib/jvm/java-21-openjdk-amd64\""