chore: add Google's Maven Central mirror (#946)

kokoro/continuous.bat

@@ -5,6 +5,9 @@ echo %JAVA_HOME%
 
 cd github/appengine-plugins-core
 
+if not exist "%HOME%\.m2" mkdir "%HOME%\.m2"
+copy settings.xml "%HOME%\.m2"
+
 call gcloud.cmd components update --quiet
 call gcloud.cmd components install app-engine-java --quiet
 

kokoro/continuous.sh

@@ -14,6 +14,10 @@ unset JAVA_TOOL_OPTIONS
 update-java-alternatives -s /usr/lib/jvm/java-1.8.0-openjdk-amd64
 export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
 
+# Use GCP Maven Mirror
+mkdir -p ${HOME}/.m2
+cp settings.xml ${HOME}/.m2
+
 if [ "$EUID" -ne 0 ]
 then
  # not running as root

kokoro/continuous_mac.sh

@@ -11,4 +11,9 @@ gcloud components update
 gcloud components install app-engine-java
 
 cd github/appengine-plugins-core
+
+# Use GCP Maven Mirror
+mkdir -p ${HOME}/.m2
+cp settings.xml ${HOME}/.m2
+
 ./mvnw clean install cobertura:cobertura -B -U

kokoro/release_build.sh

@@ -9,6 +9,11 @@ sudo -E /opt/google-cloud-sdk/bin/gcloud components update -q
 sudo -E /opt/google-cloud-sdk/bin/gcloud components install app-engine-java -q
 
 cd github/appengine-plugins-core
+
+# Use GCP Maven Mirror
+mkdir -p ${HOME}/.m2
+cp settings.xml ${HOME}/.m2
+
 mvn -Prelease -B -U verify -Dtest=!FilePermissionsTest
 
 # copy pom with the name expected in the Maven repository

settings.xml

@@ -0,0 +1,32 @@
+<!--
+ ~ Copyright 2022 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
+ ~
+ ~ 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.
+ -->
+
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+ https://maven.apache.org/xsd/settings-1.0.0.xsd">
+ <mirrors>
+ <mirror>
+ <!-- Google's Maven Central mirror for Americas
+ https://maven-central.storage.googleapis.com/index.html
+ -->
+ <id>google-maven-central</id>
+ <name>GCS Maven Central mirror</name>
+ <url>https://maven-central.storage-download.googleapis.com/maven2/</url>
+ <mirrorOf>central</mirrorOf>
+ </mirror>
+ </mirrors>
+</settings>