Specify amd64 platform to fix ov builds on macOS (#4932)

docker/dev_env/run.sh

@@ -26,6 +26,9 @@ shared_args=(
 run_args=(
   -d
   --name "$container_name"
+  # Since we have build an amd64 image, we must specify the platform to
+  # suppress warnings about platform mismatch.
+  --platform linux/amd64
   # Use host network so things like Sphinx and the frontend that run directly in `ov`
   # will have ports available on the host (and this way we don't have to manually map each one)
   --network host

ov

@@ -92,7 +92,8 @@ init)
   ;;
 
 build)
-  docker build "${@:2}" -t openverse-dev_env:latest "$dev_env"
+  # k6 does not install on aarch64, so we must specify the platform on macOS.
+  docker build "${@:2}" --platform linux/amd64 -t openverse-dev_env:latest "$dev_env"
   ;;
 
 setup-env)