Fix extracting packages from the wheel list/index (#619)

builder/__main__.py

@@ -11,6 +11,7 @@
 
 from builder.apk import install_apks
 from builder.infra import (
+    create_wheels_list,
     extract_packages_from_index,
     check_available_binary,
     create_wheels_folder,
@@ -111,8 +112,8 @@ def builder(
 
         wheels_dir = create_wheels_folder(output)
         wheels_index = create_wheels_index(index)
-
-        package_index = extract_packages_from_index(wheels_index)
+        wheels_list = create_wheels_list(index)
+        package_index = extract_packages_from_index(wheels_list)
 
         # Setup build helper
         if apk:

builder/infra.py

@@ -39,10 +39,15 @@ def create_wheels_folder(base_folder: Path) -> Path:
 
 
 def create_wheels_index(base_index: str) -> str:
-    """Create wheels specific URL."""
+    """Create wheels specific URL with a PEP 503 index."""
     return f"{base_index}/{_MUSLLINUX}-index/"
 
 
+def create_wheels_list(base_index: str) -> str:
+    """Create wheels specific URL that has a list of all wheel files."""
+    return f"{base_index}/{_MUSLLINUX}/"
+
+
 def create_package_map(packages: List[str]) -> Dict[str, AwesomeVersion]:
     """Create a dictionary from package base name to package and version string."""
     results = {}