Rename ARCH to TARGETARCH for multi platform build by docker buildx

[morlay]

Which problem is this PR solving?

• first step to support Multiarch docker images #2292

Short description of the changes

• TARGETARCH is the ARG need for buildx https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope

now could build local by

make build-ui
make build-query GOOS=linux GOARCH=arm64
make build-all-in-one GOOS=linux GOARCH=arm64
make build-query GOOS=linux GOARCH=amd64
make build-all-in-one GOOS=linux GOARCH=amd64
repo=jaegertracing/all-in-one # all change to custom repo
docker buildx build --platform=linux/amd64,linux/arm64 --push -f cmd/all-in-one/Dockerfile -t $repo:latest cmd/all-in-one

demo https://hub.docker.com/r/querycap/jaegertracing-all-in-one/tags

In travis, need to setup buildx with qemu https://github.com/crazy-max/ghaction-docker-buildx

[morlay]

mv all build in docker will be make docker buildx happy.

[codecov]

Codecov Report

Merging #2320 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2320   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files         203      203           
  Lines       10291    10291           
=======================================
  Hits         9899     9899           
  Misses        336      336           
  Partials       56       56           

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[pavolloffay]

Could you please apply the change to all docker files?

[morlay]

@pavolloffay sure.