Update cross compile toolchains (#12069)

* Regenerate cross-toolchain configs

* Remove some extra whitespaces

* Run gazelle and add that note to the README

* Format numbered lists better in markdown

* gcloud docker command is deprecated, just use docker

* Add comment about docker credentials for gcr.io

* Update dockerfile, some remote executor config work

* gazelle

* Remove commented lines

---------

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

validator/package/BUILD.bazel

@@ -46,6 +46,7 @@ pkg_deb(
     package = "prysm-validator",
     postinst = "postinst.sh",
     preinst = "preinst.sh",
+    tags = ["no-remote"],
     version_file = "//runtime:version_file",
     visibility = ["//validator:__pkg__"],
 )