Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
git-subtree-split: fcd3b9a85ef36e46643dc30176cea1a7ad62e02b

.github/mergeable.yml

@@ -0,0 +1,18 @@
+mergeable:
+  pull_requests:
+    label:
+      and:
+        - must_exclude:
+            regex: '^disposition/DO NOT MERGE'
+            message: 'Pull request marked not mergeable'
+        - or:
+          - and:
+            - must_include:
+                regex: 'release notes: yes'
+                message: 'Include release notes: yes'
+            - must_include:
+                regex: '^(autotools|bazel|c#|c\+\+|cleanup|cmake|conformance tests|integration|go|java|javascript|objective-c|php|protoc|python|ruby|kotlin)'
+                message: 'at least a language label (e.g., c++, java, python). Or apply one of the following labels: autotools, bazel, cmake, cleanup, conformance tests, integration, protoc.'
+          - must_include:
+              regex: 'release notes: no'
+              message: 'Include release notes: no'