Change Dockerfiles (and make targets) to use cross-compile.

[jkh52]

Continue supporting ARCH env for backward compat, but introduce {BUILDARCH, TARGETARCH}.

This is a big speedup, compared to qemu. On my 10y old machine, make docker-build-all took less than 5m. For comparison, see historical latency (source: #274):

Time consumed for each arch:

arm: 1h28m59s
amd64: 2m13s
arm64:16m2s
ppc64le: 19m17s
s390x: 14m14s

At #572 we already changed the dockerfiles (support GO_TOOLCHAIN and GO_VERSION). It would be nice to group this additional change together (add to release-0.30).

[k8s-ci-robot]

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[jkh52]

/assign @mainred

[k8s-ci-robot]

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[jkh52]

/test all

[k8s-ci-robot]

@jkh52: No jobs can be run with /test all.
The following commands are available to trigger required jobs:

• /test pull-apiserver-network-proxy-docker-build-amd64-master
• /test pull-apiserver-network-proxy-docker-build-arm64-master
• /test pull-apiserver-network-proxy-make-lint-master
• /test pull-apiserver-network-proxy-test-master

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/test all

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[jkh52]

/test pull-apiserver-network-proxy-docker-build-amd64-master
/test pull-apiserver-network-proxy-docker-build-arm64-master
/test pull-apiserver-network-proxy-make-lint-master
/test pull-apiserver-network-proxy-test-master

[jkh52]

Flake:

--- FAIL: TestProxyDial_RequestCancelled_Concurrent_GRPC (61.95s)
    proxy_test.go:399: Timed out waiting for tunnel to close
    proxy_test.go:426: Agent connections leaked: 
        
        Diff:
        --- metric output does not match expectation; want
        +++ got:
        @@ -2,3 +2,3 @@
         # TYPE konnectivity_network_proxy_agent_open_endpoint_connections gauge
        -konnectivity_network_proxy_agent_open_endpoint_connections 0
        +konnectivity_network_proxy_agent_open_endpoint_connections 1

/retest

[tallclair]

/lgtm