add back the amd64 platform by default on arm

scripts/builder

@@ -2,10 +2,11 @@
 
 set -euo pipefail
 
-# This is used, in concert with scripts/build/_build-server, to run Dark inside the
-# devcontainer. There is a strong connection between these files and
-# .circleci/config.yml, as well as devcontainer.yaml. Generally, if you add something
-# to one of these files, there's an equivalent to be added in both .circleci/config.yml and devcontainer.yaml.
+# This is used, in concert with scripts/build/_build-server, to run Dark inside
+# the devcontainer. There is a strong connection between these files and
+# .circleci/config.yml, as well as devcontainer.yaml. Generally, if you add
+# something to one of these files, there's an equivalent to be added in both
+# .circleci/config.yml and devcontainer.yaml.
 
 if [[ "${BASH_VERSINFO[0]}" -lt 4 ]]; then
   # Because we use `-v`
@@ -33,7 +34,12 @@ gid=$((gid > 1000 ? gid : 1000))
 # --------------
 if [[ ! -v NEVER_REBUILD_DOCKER ]]; then
   echo "Building docker image"
-  docker buildx build -t dark --build-arg uid="$(id -u)" --build-arg gid="$gid" .
+  # Always build for linux/amd64 (new OSX arm machines have emulation). This is
+  # slow on MacOS but it gets there eventually.
+  # Most of the work is done to enable arm64 builds, but rescript 9.1.4 won't
+  # build on arm64 (10 supposedly does), and dotnet won't support building wasm
+  # until dotnet 8 at the earliest.
+  docker buildx build --platform linux/amd64 -t dark --build-arg uid="$(id -u)" --build-arg gid="$gid" .
 
   echo "Removing running containers"
   c=$(docker ps --filter "name=dark-builder" -q)
@@ -122,6 +128,7 @@ docker run \
   --init \
   --rm \
   -i \
+  --platform linux/amd64 \
   --dns 8.8.8.8 \
   --dns 8.8.4.4 \
   --name dark-builder \