Fail to fetch repo on arm-debug

All https://ci.nodejs.org/job/node-test-commit-arm-debug/ builds are failing in the past 48 hours

 > git fetch --no-tags --force --progress -- git@github.com:nodejs/node.git +refs/heads/*:refs/remotes/origin/* +refs/pull/60711/head:refs/remotes/origin/_jenkins_local_branch # timeout=30
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from git@github.com:nodejs/node.git
	at PluginClassLoader for git//hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:998)
	at PluginClassLoader for git//hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1239)
	at PluginClassLoader for git//hudson.plugins.git.GitSCM._checkout(GitSCM.java:1310)
	at PluginClassLoader for git//hudson.plugins.git.GitSCM.checkout(GitSCM.java:1277)
	at hudson.scm.SCM.checkout(SCM.java:540)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1250)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:649)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:522)
	at hudson.model.Run.execute(Run.java:1860)
	at PluginClassLoader for matrix-project//hudson.matrix.MatrixRun.run(MatrixRun.java:153)
	at hudson.model.ResourceController.execute(ResourceController.java:101)
	at hudson.model.Executor.run(Executor.java:460)
Caused by: hudson.plugins.git.GitException: Command "git fetch --no-tags --force --progress -- git@github.com:nodejs/node.git +refs/heads/*:refs/remotes/origin/* +refs/pull/60711/head:refs/remotes/origin/_jenkins_local_branch" returned status code 128:
stdout: 
stderr: ssh: Could not resolve hostname github.com: Temporary failure in name resolution
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

	at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2844)
	at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:2189)
	at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:638)
	at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:173)
	at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:164)
	at hudson.remoting.UserRequest.perform(UserRequest.java:225)
	at hudson.remoting.UserRequest.perform(UserRequest.java:50)
	at hudson.remoting.Request$2.run(Request.java:391)
	at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:81)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:138)
	at java.base/java.lang.Thread.run(Thread.java:840)
	Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from 20.172.67.207/20.172.67.207:35820
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1916)
		at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:384)
		at hudson.remoting.Channel.call(Channel.java:1108)
		at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:155)
		at jdk.internal.reflect.GeneratedMethodAccessor321.invoke(Unknown Source)
		at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.base/java.lang.reflect.Method.invoke(Method.java:569)
		at PluginClassLoader for git-client//org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:140)
		at PluginClassLoader for git-client/jdk.proxy76/jdk.proxy76.$Proxy162.execute(Unknown Source)
		at PluginClassLoader for git//hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:996)
		at PluginClassLoader for git//hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1239)
		at PluginClassLoader for git//hudson.plugins.git.GitSCM._checkout(GitSCM.java:1310)
		at PluginClassLoader for git//hudson.plugins.git.GitSCM.checkout(GitSCM.java:1277)
		at hudson.scm.SCM.checkout(SCM.java:540)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1250)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:649)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:522)
		at hudson.model.Run.execute(Run.java:1860)
		at PluginClassLoader for matrix-project//hudson.matrix.MatrixRun.run(MatrixRun.java:153)
		at hudson.model.ResourceController.execute(ResourceController.java:101)
		at hudson.model.Executor.run(Executor.java:460)
ERROR: Error fetching remote repo 'origin'

Start with the node-test-commit-arm-debug job and inspect the logged git fetch command. Check why the arm-debug environment cannot resolve github.com, then verify the job can fetch the repository successfully. Done means the affected builds no longer fail during repository checkout.