chore(bazel): add MODULE.bazel files for bzlmod

Signed-off-by: Matthieu MOREL <[email protected]>

.bazelrc

@@ -14,3 +14,4 @@
 
 # Defaults to auto which means off for Windows, explicitly enable for sh tests
 build --enable_runfiles=yes
+common --enable_bzlmod

.gitignore

@@ -12,6 +12,7 @@
 # Ignore all bazel-* symlinks. There is no full list since this can change
 # based on the name of the directory bazel is cloned into.
 /bazel-*
+MODULE.bazel.lock
 /tests/rbe_repo/examples/bazel_toolchains_client/bazel-*
 /tests/rbe_repo/examples/toolchain_config_host/bazel-*
 /rbe-test-output/

MODULE.bazel

@@ -0,0 +1,9 @@
+module(
+    name = "bazel_toolchains",
+    version = "",
+)
+
+bazel_dep(name = "bazel_skylib", version = "1.3.0")
+
+non_module_deps = use_extension("//:non_module_deps.bzl", "non_module_deps")
+use_repo(non_module_deps, "rbe_default")

non_module_deps.bzl

@@ -0,0 +1,32 @@
+# Copyright 2017 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This file contains the download of rbe_default dependency.
+
+"""
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def _non_module_deps_impl():
+    http_archive(
+        name = "rbe_default",
+        # The sha256 digest of the tarball might change without notice. So it's not
+        # included here. Please refer to the link mentioned above for instructions
+        # on how to generate your own configs.
+        urls = [
+            "https://storage.googleapis.com/rbe-toolchain/bazel-configs/rbe-ubuntu1604/latest/rbe_default.tar",
+        ],
+    )
+
+non_module_deps = module_extension(implementation = _non_module_deps_impl)