[Build] Update rules_pkg to 0.8. Also add tree inclusion patch

WORKSPACE

@@ -231,10 +231,17 @@ rules_closure_toolchains()
 
 http_archive(
     name = "rules_pkg",
-    sha256 = "451e08a4d78988c06fa3f9306ec813b836b1d076d0f055595444ba4ff22b867f",
+    patch_args = [
+        "-p1",
+    ],
+    patches = [
+        "//py:rules_pkg_tree.patch",
+    ],
     urls = [
-        "https://github.com/bazelbuild/rules_pkg/releases/download/0.7.1/rules_pkg-0.7.1.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.8.0/rules_pkg-0.8.0.tar.gz",
+        "https://github.com/bazelbuild/rules_pkg/releases/download/0.8.0/rules_pkg-0.8.0.tar.gz",
     ],
+    sha256 = "eea0f59c28a9241156a47d7a8e32db9122f3d50b505fae0f33de6ce4d9b61834",
 )
 
 load("@rules_pkg//:deps.bzl", "rules_pkg_dependencies")

py/rules_pkg_tree.patch

@@ -0,0 +1,16 @@
+diff --git a/pkg/private/tar/build_tar.py b/pkg/private/tar/build_tar.py
+index ab16610d..b6b75bd7 100644
+--- a/pkg/private/tar/build_tar.py
++++ b/pkg/private/tar/build_tar.py
+@@ -309,7 +309,10 @@ def add_manifest_entry(self, entry_list, file_attributes):
+     elif entry.entry_type == manifest.ENTRY_IS_EMPTY_FILE:
+       self.add_empty_file(entry.dest, **attrs)
+     else:
+-      self.add_file(entry.src, entry.dest, **attrs)
++      if os.path.isdir(entry.src):
++        self.add_tree(entry.src, entry.dest, **attrs)
++      else:
++        self.add_file(entry.src, entry.dest, **attrs)
+
+
+ def main():