build failed for test-runner image

[longwuyuan]

• Build failed for test-runner image with error message

#11 [linux/arm64 stage-2  2/19] RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
#11 ERROR: process "/bin/sh -c [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf" did not complete successfully: exit code: 1

• That step is legacy because as per Ensure nsswitch.conf config for netgo docker-library/golang#441, that step is not required in recent alpine versions
• This issue for tracking the build failure https://console.cloud.google.com/cloud-build/builds;region=global/fb2ea389-b21a-432b-b518-858c0402a315?project=k8s-staging-ingress-nginx

• Available solution below. Replace

  ingress-nginx/images/test-runner/rootfs/Dockerfile

  Line 24 in 04ce923

  RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf

  with below code

RUN set -eux; \
	if [ -e /etc/nsswitch.conf ]; then \
		grep '^hosts: files dns' /etc/nsswitch.conf; \
	else \
		echo 'hosts: files dns' > /etc/nsswitch.conf; \
	fi

/triage accepted
/area stabilization

/assign

[longwuyuan]

/remove-good-first-issue

[longwuyuan]

Follow-up after #9336