Move runtime_tests.sh to align with other scripts.

PiperOrigin-RevId: 307435879

kokoro/runtime_tests/go1.12.cfg

@@ -1,4 +1,4 @@
-build_file: "github/github/kokoro/runtime_tests/runtime_tests.sh"
+build_file: "github/github/scripts/runtime_tests.sh"
 
 env_vars {
   key: "RUNTIME_TEST_NAME"

kokoro/runtime_tests/java11.cfg

@@ -1,4 +1,4 @@
-build_file: "github/github/kokoro/runtime_tests/runtime_tests.sh"
+build_file: "github/github/scripts/runtime_tests.sh"
 
 env_vars {
   key: "RUNTIME_TEST_NAME"

kokoro/runtime_tests/nodejs12.4.0.cfg

@@ -1,4 +1,4 @@
-build_file: "github/github/kokoro/runtime_tests/runtime_tests.sh"
+build_file: "github/github/scripts/runtime_tests.sh"
 
 env_vars {
   key: "RUNTIME_TEST_NAME"

kokoro/runtime_tests/php7.3.6.cfg

@@ -1,4 +1,4 @@
-build_file: "github/github/kokoro/runtime_tests/runtime_tests.sh"
+build_file: "github/github/scripts/runtime_tests.sh"
 
 env_vars {
   key: "RUNTIME_TEST_NAME"

kokoro/runtime_tests/python3.7.3.cfg

@@ -1,4 +1,4 @@
-build_file: "github/github/kokoro/runtime_tests/runtime_tests.sh"
+build_file: "github/github/scripts/runtime_tests.sh"
 
 env_vars {
   key: "RUNTIME_TEST_NAME"

scripts/runtime_tests.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Copyright 2019 The gVisor Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+source $(dirname $0)/common.sh
+
+# Check that a runtime is provided.
+if [ ! -v RUNTIME_TEST_NAME ]; then
+  echo "Must set $RUNTIME_TEST_NAME" >&2
+  exit 1
+fi
+
+install_runsc_for_test runtimes
+test_runsc "//test/runtimes:${RUNTIME_TEST_NAME}_test"