remove buildx setup

Author: dkijania

buildkite/src/Command/DockerImage.dhall

@@ -100,9 +100,7 @@ let stepLabel =
 
 let generateStep =
           \(spec : ReleaseSpec.Type)
-      ->  let installBuildx = "./scripts/docker/setup_buildx.sh"
-
-          let exportMinaDebCmd =
+      ->  let exportMinaDebCmd =
                 "export MINA_DEB_CODENAME=${DebianVersions.lowerName
                                               spec.deb_codename}"
 
@@ -228,9 +226,7 @@ let generateStep =
                   , Stable = remoteRepoCmds
                   , Local =
                     [ Cmd.run
-                        (     installBuildx
-                          ++  " && "
-                          ++  exportMinaDebCmd
+                        (     exportMinaDebCmd
                           ++  " && "
                           ++  pruneDockerImages
                           ++  maybeStartDebianRepo

buildkite/src/Command/MinaArtifact.dhall

@@ -118,8 +118,7 @@ let build_artifacts
       ->  Command.build
             Command.Config::{
             , commands =
-                  [ Cmd.run "./scripts/docker/setup_buildx.sh" ]
-                # Toolchain.select
+                  Toolchain.select
                     spec.toolchainSelectMode
                     spec.debVersion
                     spec.arch