Respect user-provided env_inherit

Author: herewasmike

python/private/pypi/pip_compile.bzl

@@ -155,6 +155,12 @@ def pip_compile(
     }
 
     env = kwargs.pop("env", {})
+    env_inherit = kwargs.pop("env_inherit", [])
+    proxy_variables = ["https_proxy", "http_proxy", "no_proxy", "HTTPS_PROXY", "HTTP_PROXY", "NO_PROXY"]
+
+    for var in proxy_variables:
+        if var not in env_inherit:
+            env_inherit.append(var)
 
     py_binary(
         name = name + ".update",
@@ -177,7 +183,7 @@ def pip_compile(
             "@@platforms//os:windows": {"USERPROFILE": "Z:\\FakeSetuptoolsHomeDirectoryHack"},
             "//conditions:default": {},
         }) | env,
-        env_inherit = ["https_proxy", "http_proxy", "no_proxy", "HTTPS_PROXY", "HTTP_PROXY", "NO_PROXY"],
+        env_inherit = env_inherit,
         # kwargs could contain test-specific attributes like size
         **dict(attrs, **kwargs)
     )