Build rust docker images for linux/amd64

ci/docker-rust/build.sh

@@ -3,7 +3,14 @@ set -ex
 
 cd "$(dirname "$0")"
 
-docker build -t solanalabs/rust .
+
+platform=()
+if [[ $(uname -m) = arm64 ]]; then
+  # Ref: https://blog.jaimyn.dev/how-to-build-multi-architecture-docker-images-on-an-m1-mac/#tldr
+  platform+=(--platform linux/amd64)
+fi
+
+docker build "${platform[@]}" -t solanalabs/rust .
 
 read -r rustc version _ < <(docker run solanalabs/rust rustc --version)
 [[ $rustc = rustc ]]