Add buildx support for build-docker.sh

[JySongWithZhangCe]

What changes are proposed in this pull request?

Fix #16821

Developers can execute cross compare with build-docker.sh
etc.
./build-docker.sh buildx linux/arm64

Why are the changes needed?

Nope.

Does this PR introduce any user facing changes?

Nope, just for developers.

[JySongWithZhangCe]

@beinan Would you like to take a look~Thanks♪(･ω･)ﾉ

[Xenorith]

in case others are using the same script, can we preserve backwards compatibility by setting the most common default value for build_mode and platform, such that if the script was called as before (ex. dev/scripts/build-docker.sh path/to/tarball) it will still operate as before?

[JySongWithZhangCe]

in case others are using the same script, can we preserve backwards compatibility by setting the most common default value for build_mode and platform, such that if the script was called as before (ex. dev/scripts/build-docker.sh path/to/tarball) it will still operate as before?

Makes sense, I'll modify it

[JySongWithZhangCe]

in case others are using the same script, can we preserve backwards compatibility by setting the most common default value for build_mode and platform, such that if the script was called as before (ex. dev/scripts/build-docker.sh path/to/tarball) it will still operate as before?

Before this PR, build-docker.sh does not support setting parameters, so there is no backward compatibility issue on parameters. After the second commit is modified, it will be consistent with the previous image tag without specifying buildx.

[Xenorith]

alluxio-bot, merge this please