clean up the split partitions

otherwise we end up publishing them

part-rebuild.py

@@ -38,3 +38,7 @@ for index, partition in enumerate(partitions):
 # Then reassemble them into a new image using those squeezed partition images.
 open(RAW, "w").close()
 subprocess.run(["systemd-repart", "--size=auto", "--empty=allow", "--dry-run=no", "--definitions=mkosi.repart-rebuild", "--root", os.getcwd(), RAW], check=True)
+
+# Clean up the partitions again
+for partition in partitions:
+    os.remove(f"{partition["name"]}.raw")