Fix test_sky in release builds

sky/tools/skypy/paths.py

Index: sky/tools/skypy/paths.py
diff --git a/sky/tools/skypy/paths.py b/sky/tools/skypy/paths.py
index 51bddc7d6280b9a8dbe39388a0ead0819e9cba3c..ffbd0ca8678209ce1eb6eb9788b3c705b77da3ff 100644
--- a/sky/tools/skypy/paths.py
+++ b/sky/tools/skypy/paths.py
@@ -4,11 +4,11 @@
 
 import os
 
-BUILD_DIRECTORY = 'out'
-CONFIG_DIRECTORY = 'Debug'
-SRC_ROOT = os.path.abspath(os.path.join(__file__,
-    os.pardir, os.pardir, os.pardir, os.pardir))
-SKY_ROOT = os.path.join(SRC_ROOT, 'sky')
-GEN_ROOT = os.path.join(SRC_ROOT, BUILD_DIRECTORY, CONFIG_DIRECTORY, 'gen')
-SKY_TOOLS_DIRECTORY = os.path.join(SRC_ROOT, 'sky', 'tools')
-MOJO_SHELL_PATH = os.path.join(SRC_ROOT, BUILD_DIRECTORY, CONFIG_DIRECTORY, 'mojo_shell')
+class Paths(object):
+    def __init__(self, build_directory):
+        self.src_root = os.path.abspath(os.path.join(__file__,
+            os.pardir, os.pardir, os.pardir, os.pardir))
+        self.sky_root = os.path.join(self.src_root, 'sky')
+        self.gen_root = os.path.join(self.src_root, build_directory, 'gen')
+        self.sky_tools_directory = os.path.join(self.src_root, 'sky', 'tools')
+        self.mojo_shell_path = os.path.join(self.src_root, build_directory, 'mojo_shell')