use JAVA_HOME in ci-verify script

Author: ktoso

Samples/JavaKitSampleApp/ci-validate.sh

@@ -1,4 +1,7 @@
 #!/bin/sh
 
 swift build
-java -cp .build/plugins/outputs/javakitsampleapp/JavaKitExample/destination/JavaCompilerPlugin/Java -Djava.library.path=.build/debug com.example.swift.JavaKitSampleMain
+"$JAVA_HOME/bin/java" \
+    -cp .build/plugins/outputs/javakitsampleapp/JavaKitExample/destination/JavaCompilerPlugin/Java \
+    -Djava.library.path=.build/debug \
+    "com.example.swift.JavaKitSampleMain"