use MySQL 8.0 in Docker

Author: TomiBelan

docker-compose.yml

@@ -10,9 +10,10 @@ services:
       - db
 
   db:
-    image: mysql:5.5
-    # utf8mb4 would be better. This is for bug-for-bug consistency with svt4.
-    command: mysqld --character-set-server=utf8 --collation-server=utf8_general_ci
+    # Hack: `-debian` because `mysql:8.0` uses oraclelinux 9, which requires x86-64-v2, but omega.svt cpu is too old.
+    image: mysql:8.0-debian
+    # The default plugin (caching_sha2_password) doesn't work with PHP < 7.4.
+    command: mysqld --default-authentication-plugin=mysql_native_password
     environment:
       MYSQL_ROOT_PASSWORD: root
       MYSQL_DATABASE: anketa