fix iso- maybe??

build-docker.sh

@@ -82,7 +82,16 @@ fi
 # Modify original build-options to allow config file to be mounted in the docker container
 BUILD_OPTS="$(echo "${BUILD_OPTS:-}" | sed -E 's@\-c\s?([^ ]+)@-c /config@')"
 
-${DOCKER} build --build-arg BASE_IMAGE=debian:bookworm -t pi-gen "${DIR}"
+# Check the arch of the machine we're running on. If it's 64-bit, use a 32-bit base image instead
+case "$(uname -m)" in
+  x86_64|aarch64)
+    BASE_IMAGE=i386/debian:bookworm
+    ;;
+  *)
+    BASE_IMAGE=debian:bookworm
+    ;;
+esac
+${DOCKER} build --build-arg BASE_IMAGE=${BASE_IMAGE} -t pi-gen "${DIR}"
 
 if [ "${CONTAINER_EXISTS}" != "" ]; then
   DOCKER_CMDLINE_NAME="${CONTAINER_NAME}_cont"