Add Kokoro build config

Change-Id: If4c2aacd0a53f836150c1454e4e4dcf0d77e9eb0

kokoro/build.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Copyright 2021 Google LLC
+#
+# 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
+#
+#     https://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.
+
+
+# Fail on any error.
+set -e
+# Display commands to stderr.
+set -x
+
+GRADLE_FLAGS=()
+if [[ -n "$GRADLE_DEBUG" ]]; then
+  GRADLE_FLAGS=( --debug --stacktrace )
+fi
+
+cd $KOKORO_ARTIFACTS_DIR/git/nowinandroid
+
+./gradlew "${GRADLE_FLAGS[@]}" build
+
+exit $?

kokoro/continuous.cfg

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+# Location of the bash script.
+build_file: "nowinandroid/kokoro/build.sh"

kokoro/presubmit.cfg

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+# Location of the bash script.
+build_file: "nowinandroid/kokoro/build.sh"