ux: default avatar for action@github.com

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Models/AvatarManager.cs

@@ -49,6 +49,7 @@ public void Start()
                 Directory.CreateDirectory(_storePath);
 
             LoadDefaultAvatar("noreply@github.com", "github.png");
+            LoadDefaultAvatar("action@github.com", "github.png");
             LoadDefaultAvatar("github-actions[bot]@users.noreply.github.com", "github.png");
             LoadDefaultAvatar("unrealbot@epicgames.com", "unreal.png");