[Task]: Update Deploy docker image script and documentation for GitHub Action built candidate

[Abacn]

What needs to happen?

The current publish_docker_images script assumes rc images existed locally, It fetches IMAGES via docker images command which only looks up locally existed images (either built or pulled). As we have migrated to use github action to build rc images, we need to figure out a way to fetch rc images from remote.

A possible way is change the line to

IMAGES=$(docker search apache/beam_ --format "{{.Name}}" --limit 100)

then inside the loop,

if ! docker pull "${IMAGE}:${RELEASE}${RC_VERSION}" ; then
  continue
fi

this has two minor issue though

• docker cli does not support search image having specific tag, nor sort by update date
• the default --limit is 25, causing some images not get listed. We can bump --limit of course, but as time goes and more image name added, it can be risky to miss some image

Please comment if there are better way to do that.

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

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