runfiles,Bash: add a package for runfiles library

Add a new package that'll host the Bash runfiles
library.

See https://github.com/bazelbuild/bazel/issues/4460

Closes #4882.

PiperOrigin-RevId: 189871255
diff --git a/tools/bash/BUILD b/tools/bash/BUILD
new file mode 100644
index 0000000..2d0c314
--- /dev/null
+++ b/tools/bash/BUILD
@@ -0,0 +1,21 @@
+package(default_visibility = ["//visibility:private"])
+
+filegroup(
+    name = "srcs",
+    srcs = glob(
+        ["**"],
+        exclude = [
+            "*~",
+            ".*",
+        ],
+    ) + [
+        "//tools/bash/runfiles:srcs",
+    ],
+    visibility = ["//tools:__pkg__"],
+)
+
+filegroup(
+    name = "embedded_tools",
+    srcs = ["//tools/bash/runfiles:embedded_tools"],
+    visibility = ["//tools:__pkg__"],
+)