ci: add Discord notification for new releases

Introduced a GitHub Actions workflow to send release notifications to a Discord channel. The workflow triggers on release publishing and supports manual dispatch, ensuring important updates are shared efficiently.

Author: bjarn

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

@@ -0,0 +1,21 @@
+on:
+  release:
+    types: [ published ]
+  workflow_dispatch:
+
+jobs:
+  github-releases-to-discord:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: GitHub Releases to Discord
+        uses: SethCohen/github-releases-to-discord@v1
+        with:
+          webhook_url: ${{ secrets.DISCORD_RELEASE_WEBHOOK_URL }}
+          color: "8892be"
+          username: "Release Changelog"
+          avatar_url: "https://cdn.discordapp.com/avatars/487431320314576937/bd64361e4ba6313d561d54e78c9e7171.png"
+          content: "||@everyone||"
+          footer_title: "Changelog"
+          reduce_headings: true