move image layering to separate module for easier standalone use

Author: Tom Fay

Cargo.lock

@@ -39,6 +39,7 @@ url = { version = "2.2.2", features = ["serde"] }
 walkdir = "2.3.2"
 xattr = "1.0.1"
 ocidir = "0.2.1"
+derive_builder = "0.20.1"
 
 [dev-dependencies]
 test-temp-dir = "0.2.2"

Cargo.toml

@@ -77,7 +77,7 @@ def most_popular_packages(root, n):
         p
         for (p, _count) in sorted(
             graph_popularity_contest(new_graph).items(),
-            key=lambda x: x[1],
+            key=lambda x: (x[1], x[0]),
             reverse=True,
         )
     ]