Improve buf-ci action and add README and LICENSE

.github/workflows/buf-ci.yaml

@@ -2,15 +2,18 @@ name: Buf CI
 on:
   push:
     paths:
-      - '**.proto'
-      - '**/buf.yaml'
-      - '**/buf.lock'
-      - '**/buf.md'
-      - '**/README.md'
-      - '**/LICENSE'
-      - .github/workflows/buf-ci.yaml
+      - 'buf.yaml'
+      - 'buf.lock'
+      - 'proto/README.md'
+      - 'proto/LICENSE'
+      - 'proto/**.proto'
+      - '.github/workflows/buf-ci.yaml'
   pull_request:
     types: [opened, synchronize, reopened, labeled, unlabeled]
+    branches-ignore:
+      # Ignore PRs triggered by the 'fetch.yaml' github action, keep synced with the branch name in
+      # that file.
+      - 'fetch-modules'
   delete:
 permissions:
   contents: read

.github/workflows/fetch.yaml

@@ -44,6 +44,7 @@ jobs:
         with:
           add-paths: ./modules/sync/**
           commit-message: "Detected new managed modules references"
+          # This branch is ignored for the 'buf-ci.yaml' action. Keep this branch name synced there.
           branch: fetch-modules
           delete-branch: true
           title: "Found new managed modules references"

proto/LICENSE

@@ -0,0 +1 @@
+../LICENSE

proto/README.md

@@ -0,0 +1,20 @@
+# Managed modules
+
+## Description
+
+This module contains the definitions of the state of synced references for the Protobuf managed
+modules. See the [managed modules repository][modules-git-repo] for details.
+
+## Community
+
+For help and discussion regarding Protobuf managed modules, join us on [Slack][slack].
+
+For feature requests, bugs, or technical questions, email us at [dev@buf.build](dev@buf.build).
+
+## Legal
+
+Offered under the [Apache 2 license][license].
+
+[modules-git-repo]: https://github.com/bufbuild/modules
+[license]: https://github.com/bufbuild/modules/blob/main/LICENSE
+[slack]: https://buf.build/links/slack