Add Kokoro config for JDK 17 (#9845)

* add config for OpenJDK11

* update paths

* add JDK17 build
diff --git a/kokoro/linux/java_jdk17/continuous.cfg b/kokoro/linux/java_jdk17/continuous.cfg
new file mode 100644
index 0000000..6bac25c
--- /dev/null
+++ b/kokoro/linux/java_jdk17/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_jdk17/build.sh"
+timeout_mins: 60
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}