Merge 3.6.2 into master (#5211)

* Add webhook cache

* Add channel by name cache

* Fxing profiles in channels cache

* Fix merge

app/post.go

@@ -110,9 +110,6 @@ func CreatePost(post *model.Post, teamId string, triggerWebhooks bool) (*model.P
 		}
 	}
 
-	InvalidateCacheForChannel(rpost.ChannelId)
-	InvalidateCacheForChannelPosts(rpost.ChannelId)
-
 	if err := handlePostEvents(rpost, teamId, triggerWebhooks); err != nil {
 		return nil, err
 	}
@@ -139,6 +136,9 @@ func handlePostEvents(post *model.Post, teamId string, triggerWebhooks bool) *mo
 		channel = result.Data.(*model.Channel)
 	}
 
+	InvalidateCacheForChannel(channel)
+	InvalidateCacheForChannelPosts(channel.Id)
+
 	var user *model.User
 	if result := <-uchan; result.Err != nil {
 		return result.Err