Strip internal test fake repository for MODULE.bazel in distribution. (#976)

Fixes #953

BUILD

diff --git a/BUILD b/BUILD
index 5d05b04..52505df 100644
--- a/BUILD
+++ b/BUILD
@@ -27,9 +27,10 @@
     license_text = "LICENSE",
 )
 
-exports_files(
-    ["WORKSPACE"],
-)
+exports_files([
+    "MODULE.bazel",
+    "WORKSPACE",
+])
 
 exports_files(
     glob([
@@ -44,7 +45,6 @@
     ]) + [
         "BUILD",
         "LICENSE",
-        "MODULE.bazel",
     ],
     visibility = ["//distro:__pkg__"],
 )

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index a5a257d..6eaf859 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -25,6 +25,8 @@
     dev_dependency = True,
 )
 
+### INTERNAL ONLY - lines after this are not included in the release packaging.
+
 # Find the system Git if one is available.
 find_git = use_extension("//toolchains/git:git_configure.bzl", "experimental_find_system_git_extension", dev_dependency = True)
 use_repo(find_git, "rules_pkg_git")

distro/BUILD

diff --git a/distro/BUILD b/distro/BUILD
index 47693f7..0d8b63a 100644
--- a/distro/BUILD
+++ b/distro/BUILD
@@ -32,6 +32,7 @@
 pkg_tar(
     name = "rules_pkg-%s" % version,
     srcs = [
+        ":small_module",
         ":small_workspace",
         "//:standard_package",
         "//pkg:standard_package",
@@ -53,6 +54,13 @@
 )
 
 genrule(
+    name = "small_module",
+    srcs = ["//:MODULE.bazel"],
+    outs = ["MODULE.bazel"],
+    cmd = "sed -e '/### INTERNAL ONLY/,$$d' $(location //:MODULE.bazel) >$@",
+)
+
+genrule(
     name = "small_workspace",
     srcs = ["//:WORKSPACE"],
     outs = ["WORKSPACE"],