more scaffolding

Justfile

@@ -1,2 +1,7 @@
 image TARGET='PACKER':
-	podman build --target {{ TARGET }} -t {{ lowercase(TARGET) }} .
+	podman build --target {{ TARGET }} -t lisgd:{{ lowercase(TARGET) }} .
+
+build:
+	podman run --interactive --tty --rm --name lisgd-builder \
+		--volume ./:/work --workdir /work \
+		make lisgd:builder