Skip building buscribe under arm64

Also handle not setting MULTIPLATFORM properly

build

@@ -73,42 +73,51 @@ fi
 		
 for component in "${COMPONENTS[@]}"; do
 	echo "Building image for $component"
-	if [ -n "$MULTIPLATFORM" ]; then
-		echo "Creating multi-arch manifest"
-		"$BUILD_CMD" manifest create "wubloader-$component"
-	fi
 	latest="$BASE/wubloader-$component:latest"
 	specific="$BASE/wubloader-$component:$TAG"
-	# no way to build multi-arch in parallel, so just build amd64 first and then arm64.
-	# caching should work with both, so that'll make things less painful at least.
-	"$BUILD_CMD" build \
-		-f "$component/Dockerfile" \
-		-t "$latest" \
-		-t "$specific" \
-		--manifest "wubloader-$component" \
-		--arch amd64 \
-		"${CACHE_ARGS[@]}" \
-		.
-	"$BUILD_CMD" build \
-		-f "$component/Dockerfile" \
-		-t "$latest" \
-		-t "$specific" \
-		--manifest "wubloader-$component" \
-		--arch arm64 \
-		"${CACHE_ARGS[@]}" \
-		.
-	echo "Built image wubloader-$component:$TAG"
 	if [ -n "$MULTIPLATFORM" ]; then
+		echo "Creating multi-arch manifest"
+		"$BUILD_CMD" manifest create "wubloader-$component"
+		# no way to build multi-arch in parallel, so just build amd64 first and then arm64.
+		# caching should work with both, so that'll make things less painful at least.
+		"$BUILD_CMD" build \
+			-f "$component/Dockerfile" \
+			-t "$latest" \
+			-t "$specific" \
+			--manifest "wubloader-$component" \
+			--arch amd64 \
+			"${CACHE_ARGS[@]}" \
+			.
+		# buscribe doesn't (yet?) build under arm64 due to pulling in libc-bin, skip arm64 for it
+		if [ "$component" != "buscribe ]; then
+			"$BUILD_CMD" build \
+				-f "$component/Dockerfile" \
+				-t "$latest" \
+				-t "$specific" \
+				--manifest "wubloader-$component" \
+				--arch arm64 \
+				"${CACHE_ARGS[@]}" \
+				.
+		fi
+		echo "Built image wubloader-$component:$TAG"
 		# manifest pushes are buildah-specific. docker buildx multiplatform builds have different syntax...
 		if [ -n "$PUSH" ]; then
 			echo "Pushing tag $specific"
-			"$BUILD_CMD" manifest push --all "docker://$specific"
+			"$BUILD_CMD" manifest push --all "$specific"
 		fi
 		if [ "$PUSH" == "latest" ]; then
 			echo "Pushing tag $latest"
-			"$BUILD_CMD" manifest push --all "docker://$latest"
+			"$BUILD_CMD" manifest push --all "$latest"
 		fi
 	else
+		"$BUILD_CMD" build \
+			-f "$component/Dockerfile" \
+			-t "$latest" \
+			-t "$specific" \
+			--manifest "wubloader-$component" \
+			"${CACHE_ARGS[@]}" \
+			.
+		echo "Built image wubloader-$component:$TAG"
 		if [ -n "$PUSH" ]; then
 			echo "Pushing tag $specific"
 			"$BUILD_CMD" push "$specific"