Swift: add downgrades script to extractor pack

Author: redsun82

swift/BUILD.bazel

@@ -33,6 +33,7 @@ pkg_filegroup(
     srcs = [
         ":dbscheme_files",
         ":manifest",
+        "//swift/downgrades",
         "//swift/tools",
     ],
     visibility = ["//visibility:public"],

swift/downgrades/BUILD.bazel

@@ -0,0 +1,12 @@
+load("@rules_pkg//:mappings.bzl", "pkg_files", "strip_prefix")
+
+pkg_files(
+    name = "downgrades",
+    srcs = glob(
+        ["**"],
+        exclude = ["BUILD.bazel"],
+    ),
+    prefix = "downgrades",
+    strip_prefix = strip_prefix.from_pkg(),
+    visibility = ["//swift:__pkg__"],
+)