feat(bzlmod): mark toolchains extension as reproducible (#970)

MODULE.bazel

@@ -8,6 +8,7 @@ module(
 )
 
 # Lower-bounds (minimum) versions for direct runtime dependencies
+bazel_dep(name = "bazel_features", version = "1.9.0")
 bazel_dep(name = "bazel_skylib", version = "1.5.0")
 bazel_dep(name = "platforms", version = "0.0.10")
 
@@ -79,4 +80,3 @@ use_repo(host_platform, "host_platform")
 bazel_dep(name = "aspect_rules_lint", version = "1.0.0-rc10", dev_dependency = True)
 bazel_dep(name = "bazel_skylib_gazelle_plugin", version = "1.5.0", dev_dependency = True)
 bazel_dep(name = "buildifier_prebuilt", version = "6.4.0", dev_dependency = True)
-bazel_dep(name = "bazel_features", version = "0.2.0", dev_dependency = True)

lib/extensions.bzl

@@ -25,6 +25,7 @@ load(
     "register_yq_toolchains",
     "register_zstd_toolchains",
 )
+load("@bazel_features//:features.bzl", "bazel_features")
 load("//lib/private:extension_utils.bzl", "extension_utils")
 load("//lib/private:host_repo.bzl", "host_repo")
 
@@ -117,6 +118,11 @@ def _toolchains_extension_impl(mctx):
         get_version_fn = lambda attr: attr.core_version,
     )
 
+    if bazel_features.external_deps.extension_metadata_has_reproducible:
+        return mctx.extension_metadata(reproducible = True)
+
+    return mctx.extension_metadata()
+
 toolchains = module_extension(
     implementation = _toolchains_extension_impl,
     tag_classes = {