Add `dist` as an order-only prerequisite for Firecracker kernel
I previously missed this hidden dependency in a recent Makefile
refactoring. Now, we'll always ensure the directory is present before
trying to build a kernel.
@@ -623,5 +623,5 @@ generate-sqlx-data: # Regenerate sqlx-data.json based on queries made in Rust c
./src/rust/bin/generate_sqlx_data.sh
# Intentionally not phony, as this generates a real file
-dist/firecracker_kernel.tar.gz: firecracker/generate_firecracker_kernel.sh
+dist/firecracker_kernel.tar.gz: firecracker/generate_firecracker_kernel.sh | dist
./firecracker/generate_firecracker_kernel.sh
