ci: publish release notes to Discord (#422)

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

.github/workflows/release-to-discord.yaml

@@ -0,0 +1,20 @@
+on:
+  release:
+    types: [published]
+
+jobs:
+  github-releases-to-discord:
+    if: "! contains(github.event.release.tag_name, '-')"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Github Releases To Discord
+        uses: SethCohen/[email protected]
+        with:
+          webhook_url: ${{ secrets.WEBHOOK_URL }}
+          color: "2105893"
+          username: "New Release: Protocol Contracts"
+          max_description: "4096"
+          reduce_headings: true
+          avatar_url: "https://raw.githubusercontent.com/zeta-chain/docs/refs/heads/main/public/img/icons/zetachain/square/white-on-green.png"