Fix proxy settings for maven smoke tests

dd-smoke-tests/maven/src/test/groovy/datadog/smoketest/MavenSmokeTest.groovy

@@ -62,6 +62,7 @@ class MavenSmokeTest extends CiVisibilitySmokeTest {
   }
 
   def "test #projectName, v#mavenVersion"() {
+    println "Starting: ${projectName} ${mavenVersion}"
     Assumptions.assumeTrue(Jvm.current.isJavaVersionCompatible(minSupportedJavaVersion),
       "Current JVM " + Jvm.current.javaVersion + " is not compatible with minimum required version " + minSupportedJavaVersion)
 
@@ -245,6 +246,9 @@ class MavenSmokeTest extends CiVisibilitySmokeTest {
     def projectResourcesUri = this.getClass().getClassLoader().getResource(projectFilesSources).toURI()
     def projectResourcesPath = Paths.get(projectResourcesUri)
     copyFolder(projectResourcesPath, projectHome)
+
+    def sharedSettingsPath = Paths.get(this.getClass().getClassLoader().getResource("settings.mirror.xml").toURI())
+    Files.copy(sharedSettingsPath, projectHome.resolve("settings.mirror.xml"))
   }
 
   private void copyFolder(Path src, Path dest) throws IOException {
@@ -332,7 +336,10 @@ class MavenSmokeTest extends CiVisibilitySmokeTest {
     command.addAll(jvmArguments(runWithAgent, setServiceName, additionalAgentArgs))
     command.addAll((String[]) ["-jar", mavenRunnerShadowJar])
     command.addAll(programArguments())
-    command.addAll(["-s", "${projectHome.toAbsolutePath()}/settings.xml".toString()])
+
+    if (System.getenv().get("MAVEN_REPOSITORY_PROXY") != null) {
+      command.addAll(["-s", "${projectHome.toAbsolutePath()}/settings.mirror.xml".toString()])
+    }
     command.addAll(mvnCommand)
 
     ProcessBuilder processBuilder = new ProcessBuilder(command)

dd-smoke-tests/maven/src/test/resources/settings.mirror.xml

@@ -0,0 +1,9 @@
+<settings>
+  <mirrors>
+    <mirror>
+      <id>env-proxy</id>
+      <mirrorOf>*</mirrorOf>
+      <url>${env.MAVEN_REPOSITORY_PROXY}</url>
+    </mirror>
+  </mirrors>
+</settings>