chore: add rules_buf

it comes from aspect-forks until bufbuild/rules_buf#42 is merged, hopefully for the next release

modules/rules_buf/0.1.1/MODULE.bazel

@@ -0,0 +1,16 @@
+"Bazel module definition for bzlmod"
+module(
+    name = "rules_buf",
+    version = "0.1.1", # Replaced when publishing
+    compatibility_level = 1,
+)
+
+bazel_dep(name = "platforms", version = "0.0.4")
+# Only needed because rules_proto doesn't provide the protoc toolchain yet.
+# TODO(alex/sahin): remove in the future
+bazel_dep(name = "protobuf", version = "21.7", repo_name = "com_google_protobuf")
+bazel_dep(name = "rules_proto", version = "5.3.0-21.7")
+
+ext = use_extension("//buf:extensions.bzl", "ext")
+use_repo(ext, "rules_buf_toolchains")
+register_toolchains("@rules_buf_toolchains//:all")

modules/rules_buf/0.1.1/patches/module_dot_bazel_version.patch

@@ -0,0 +1,12 @@
+diff --git a/MODULE.bazel b/MODULE.bazel
+index 973e2ba..32942a5 100644
+--- a/MODULE.bazel
++++ b/MODULE.bazel
+@@ -1,7 +1,7 @@
+ "Bazel module definition for bzlmod"
+ module(
+     name = "rules_buf",
+-    version = "0.0.0", # Replaced when publishing
++    version = "0.1.1", # Replaced when publishing
+     compatibility_level = 1,
+ )

modules/rules_buf/0.1.1/presubmit.yml

@@ -0,0 +1,10 @@
+bcr_test_module:
+  module_path: 'examples/bzlmod'
+  matrix:
+    platform: ['ubuntu2004']
+  tasks:
+    run_tests:
+      name: 'Run test module'
+      platform: ${{ platform }}
+      test_targets:
+        - '//...'

modules/rules_buf/0.1.1/source.json

@@ -0,0 +1,9 @@
+{
+    "integrity": "sha256-CjfiYuajROyN2Cu4mYd+aY6zCNziwig8DFx/fUH+Cqw=",
+    "strip_prefix": "rules_buf-99af4b12716531021b9160fa2c622df4c5e8a0de",
+    "patch_strip": 1,
+    "patches": {
+        "module_dot_bazel_version.patch": "sha256-4rf0fU4XVGXhDXfLEqjz/KoOP2wnq/KRW+Ec6k0z5EU="
+    },
+    "url": "https://github.com/aspect-forks/rules_buf/archive/99af4b12716531021b9160fa2c622df4c5e8a0de.zip"
+}

modules/rules_buf/metadata.json

@@ -0,0 +1,17 @@
+{
+    "homepage": "https://github.com/bufbuild/rules_buf",
+    "maintainers": [
+        {
+            "email": "alex@aspect.dev",
+            "github": "alexeagle",
+            "name": "Alex Eagle"
+        }
+    ],
+    "repository": [
+        "github:aspect-forks/rules_buf"
+    ],
+    "versions": [
+        "0.1.1"
+    ],
+    "yanked_versions": {}
+}