add yaml file (#13268)

aptos-move/aptos-release-builder/data/reject_unstable_bytecode.yaml

@@ -0,0 +1,14 @@
+---
+remote_endpoint: ~
+name: "v1.12"
+proposals:
+  - name: enable_checking_unstable_bytecode
+    metadata:
+      title: "Enable the compilation metadata and the check to reject unstable bytecode to be published to mainnet"
+      description: "Enable the compilation metadata and reject unstable bytecode to be published to mainnet"
+      discussion_url: "https://github.com/aptos-labs/aptos-core/pull/12814"
+    execution_mode: MultiStep
+    update_sequence:
+      - FeatureFlag:
+          enabled:
+            - reject_unstable_bytecode