[Etherpad] Bump to MySQL 8 : hope performance increases

pica-etherpad/docker-compose.yml

@@ -40,7 +40,7 @@ services:
       - docker_default
 
   etherpad-db:
-    image: mysql:5.7
+    image: mysql:8
     container_name: etherpad-db
     security_opt:
       - no-new-privileges
@@ -52,6 +52,6 @@ services:
     env_file: ./secrets/etherpad-db.secrets
     restart: unless-stopped
     # See https://stackoverflow.com/questions/41134785/how-to-solve-mysql-warning-innodb-page-cleaner-1000ms-intended-loop-took-xxx
-    command: --innodb_lru_scan_depth=128
+    command: --innodb_lru_scan_depth=128 --default-authentication-plugin=mysql_native_password
     networks:
       - docker_default