testing/k3s: fix cni path, build server, add alternative bin

7 jobs for !11646 with k3s in 14 minutes and 18 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #191381
docker-alpine x86_64
lint

00:00:26

 
  Build
passed #191386
docker-alpine ci-build aarch64
build-aarch64

00:02:04

passed #191387
docker-alpine ci-build armv7
build-armv7

00:03:48

passed #191385
docker-alpine ci-build ppc64le
build-ppc64le

00:08:36

passed #191384
docker-alpine ci-build s390x
build-s390x

00:02:22

passed #191383
docker-alpine ci-build x86
build-x86

00:01:50

passed #191382
docker-alpine ci-build x86_64
build-x86_64

00:13:52