Error on store emoticons on MySQL Table even with utf8mb4 charset

Question

I'm trying to allow user to add emoticons to your personal message.

All posts tells me to change default charset, but I already changed my collation and charset to utf8mb4.

ALTER DATABASE mydb CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
ALTER TABLE mytable CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE mytable CHANGE message message VARCHAR(1000) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

but when I try:

UPDATE mytable SET message = '' WHERE (`id` = '1');

I still getting the fallowing error:

Incorrect string value: '\xF0\x9F\x92\x97\xF0\x9F...'

What am I still missing?

I'm running all these commands on MySQL Workbench connect to a MySQL 5.7 server.

I Created my database using Docker using Docker-compose.

my-db:
  image: mysql:5.7
  command: --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-allowed-packet=1073741824 

Also I got the fallowing results from mysql variables.

character_set_client    utf8
character_set_connection    utf8
character_set_database  utf8mb4
character_set_filesystem    binary
character_set_results   utf8
character_set_server    utf8mb4
character_set_system    utf8
character_sets_dir  /usr/share/mysql/charsets/
collation_connection    utf8_general_ci
collation_database  utf8mb4_unicode_ci
collation_server    utf8mb4_unicode_ci