feat(cc_image): allow setting env vars

cc/image.bzl

@@ -63,13 +63,14 @@ DEFAULT_BASE = select({
     "//conditions:default": "@cc_image_base//image",
 })
 
-def cc_image(name, base = None, deps = [], layers = [], binary = None, **kwargs):
+def cc_image(name, base = None, deps = [], layers = [], env = {}, binary = None, **kwargs):
     """Constructs a container image wrapping a cc_binary target.
 
   Args:
     name: Name of the cc_image target.
     base: Base image to use for the cc_image.
     deps: Dependencies of the cc_image.
+    env: Environment variables for the cc_image.
     binary: An alternative binary target to use instead of generating one.
     layers: Augments "deps" with dependencies that should be put into
            their own layers.
@@ -97,6 +98,7 @@ def cc_image(name, base = None, deps = [], layers = [], binary = None, **kwargs)
         binary = binary,
         visibility = visibility,
         tags = tags,
+        env = env,
         args = kwargs.get("args"),
         data = kwargs.get("data"),
         testonly = kwargs.get("testonly"),