Change Dockerfile.echo base image

[code-elinka]

Debian:9 is too old to be used and
it needs to be updated

[aojea]

if we do this, is better to move to distroless images https://github.com/GoogleContainerTools/distroless

[code-elinka]

if we do this, is better to move to distroless images https://github.com/GoogleContainerTools/distroless
Done, thank you. I tested that it runs:

elinka@elinka:~/ingress-gce$ docker run -it gcr.io/<personal-registry>/echo:local
I0426 16:04:20.608087       1 main.go:33] Starting echo: "v1.23.0-14-gc23429dde"

Tell me if you think there is a benefit to use nonroot version of that image. I am not aware of pros/cons

[code-elinka]

/assign @aojea

[aojea]

in general the less privileges the best, but AFAIK this image is only used for test

/lgtm
/approve

[code-elinka]

in general the less privileges the best, but AFAIK this image is only used for test

/lgtm /approve

Done:

Digest: sha256:09ba2fe4c13b4a623acb5289a866e2d06ecbffdcdb8d3532a43902e9d6709fa8
Status: Downloaded newer image for gcr.io/REGISTRY/echo:nonroot
I0427 08:44:14.366307       1 main.go:33] Starting echo: "v1.23.0-14-gc23429dde"

[aojea]

you have to rebase, commit 019d54a already merged

[code-elinka]

oops

you have to rebase, commit 019d54a already merged

[aojea]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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