build(ci): add discord message on docker release (#375)

Signed-off-by: Ran Ribenzaft <ranrib@users.noreply.github.com>

.github/workflows/docker-release.yml

@@ -131,4 +131,11 @@ jobs:
       uses: CasperWA/push-protected@v2
       with:
         token: ${{ secrets.DRAGONFLY_TOKEN }}
-        branch: main
+        branch: main
+
+    - name: Discord notification
+      env:
+        DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+      uses: Ilshidur/action-discord@0c4b27844ba47cb1c7bee539c8eead5284ce9fa9
+      with:
+        args: 'DragonflyDB version [${{ env.TAG_NAME }}](https://github.com/dragonflydb/dragonfly/releases/tag/v${{ env.TAG_NAME }}) has been released 🎉'