Documentation issue: Installing Bazel on Arm

[mattsplats]

Documentation URL: https://docs.bazel.build/versions/master/install-ubuntu.html

Install instructions cover using the Debian repo, but do not mention that this will not work for arm64 systems. arch is specified as amd64, but specifying arm64 will also fail because the Debian repo does not contain this build currently.

Instructions should state that the Debian repo and build scripts are not available for arm64 systems. Bazelisk, the pre-built binary, or building from source should be used instead.

Perhaps:

Install Bazel on Ubuntu using one of the following methods:
- Use Bazelisk (recommended)
- Use our custom APT repository
- Use the binary installer
- Compile Bazel from source

APT installation is not available for Arm-based systems. Instead, use one of the following methods:
- Use Bazelisk (recommended)
- Use the pre-built arm64 binary
- Compile Bazel from source

[jin]

cc @philwo

[mattsplats]

Related: should make it clear that Bazelisk will work for Redhat-based and other distros. Another page may be useful for this.

[mattsplats]

Just following up on this - I can submit a PR if it would help. Thanks!

[philwo]

@mattsplats Thank you! Sorry, I didn't get around to update the docs myself, but I'd be happy to review a PR.

[mattsplats]

No worries. There seems to be a delta between the Github readme and the web instructions - is there a pipeline that should publish the document? I can submit changes but want to be sure they make it to the website.

[philwo]

@mattsplats This part of the webseite is versioned together with Bazel and the linked commit came after Bazel 3.5.x was cut from the master branch. If you switch the shown version to master in the drop-down in the top-left corner of the website, it should show the latest version. :)

[mattsplats]

Ahh, got it, thanks.