ci: use AOSS repository

AOSS (https://cloud.google.com/security/products/assured-open-source-software)
provides secure OSS packages

AOSS requires to use a Kokoro custom pool. We use yoshi-ubuntu pool, where
`gcloud components install app-engine-java --quiet` failed with:

```
ERROR: (gcloud.components.install)
You cannot perform this action because the Google Cloud CLI component manager
is disabled for this installation. You can run the following command
to achieve the same result for this installation:

sudo apt-get install google-cloud-cli-app-engine-java
```

Change-Id: Id4befec68295e0207b4161476aaa966bd6ad77b6

.kokoro/continuous.sh

@@ -18,8 +18,11 @@ if [ "$EUID" -ne 0 ]
 then
   # not running as root
   # TODO: skip unit tests because integration tests are running by maven-surefire-plugin with a unknown reason.
-  ./mvnw clean install -V -B -U -DskipSurefire=true -Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss:SSS
+  ./mvnw clean install -V -B -U -DskipSurefire=true \
+      -Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss:SSS
 else
   # running as root - skip file permissions tests that don't work on Docker
-  ./mvnw clean install -V -B -U -DskipSurefire=true -Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss:SSS -Dtest=!FilePermissionsTest
+  ./mvnw clean install -V -B -U -DskipSurefire=true \
+      -Dorg.slf4j.simpleLogger.showDateTime=true -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss:SSS \
+      -Dtest=!FilePermissionsTest
 fi

.kokoro/stage.sh

@@ -32,17 +32,26 @@ create_settings_xml_file "${MAVEN_SETTINGS_FILE}"
 mkdir -p "${HOME}"/.m2
 cp settings.xml "${HOME}"/.m2
 
-gcloud components install app-engine-java --quiet
+# AOSS 1P authentication verification (go/aoss1p:oss-binaries#usage-instructions)
+echo "gcloud config get-value core/account:"
+gcloud config get-value core/account
+echo "-------- end of gcloud --------"
+echo "AOSS authentication test:"
+wget --header="Authorization: Bearer $(gcloud auth print-access-token)" https://us-maven.pkg.dev/cloud-aoss-1p/cloud-aoss-1p-java/log4j/log4j/1.2.17/log4j-1.2.17.pom
+echo "-------- end of AOSS authentication test ------"
+
+# gcloud components install app-engine-java --quiet
+# apt-get install -y google-cloud-cli-app-engine-java
 
 echo "Staging a release"
 # stage release
 ./mvnw clean deploy \
   -Dorg.slf4j.simpleLogger.showDateTime=true \
   -Dorg.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss:SSS \
   --show-version \
-  --no-transfer-progress \
   --batch-mode \
   --settings "${MAVEN_SETTINGS_FILE}" \
+  -Paoss \
   -DskipTests=true \
   -DperformRelease=true \
   -Dgpg.executable=gpg \

.mvn/extensions.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2024 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.
+  -->
+
+<extensions>
+    <extension>
+        <groupId>com.google.cloud.artifactregistry</groupId>
+        <artifactId>artifactregistry-maven-wagon</artifactId>
+        <version>2.2.1</version>
+    </extension>
+</extensions>

app-maven-plugin/pom.xml

@@ -452,5 +452,15 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+      <id>aoss</id>
+      <repositories>
+        <repository>
+          <id>aoss-artifact-registry</id>
+          <name>AOSS Repository</name>
+          <url>artifactregistry://us-maven.pkg.dev/cloud-aoss-1p/cloud-aoss-1p-java</url>
+        </repository>
+      </repositories>
+    </profile>
   </profiles>
 </project>

appengine-plugins-core/pom.xml

@@ -559,5 +559,15 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+      <id>aoss</id>
+      <repositories>
+        <repository>
+          <id>aoss-artifact-registry</id>
+          <name>AOSS Repository</name>
+          <url>artifactregistry://us-maven.pkg.dev/cloud-aoss-1p/cloud-aoss-1p-java</url>
+        </repository>
+      </repositories>
+    </profile>
   </profiles>
 </project>

pom.xml

@@ -28,6 +28,13 @@
         </configuration>
       </plugin>
     </plugins>
+    <extensions>
+      <extension>
+        <groupId>com.google.cloud.artifactregistry</groupId>
+        <artifactId>artifactregistry-maven-wagon</artifactId>
+        <version>2.2.1</version>
+      </extension>
+    </extensions>
   </build>
 
   <profiles>