I can't find a reason to switch back to unspecified utf8

- https://mariadb.com/kb/en/unicode/
  - the meaning of utf8 will change from 10.5 to 10.6
- https://mariadb.com/docs/reference/mdb/system-variables/collation_server/
  - a majority of setups use utf8mb4_unicode_ci

Ref Yolean/kubernetes-mysql-cluster#35

docker-compose.yml

@@ -41,6 +41,8 @@ services:
       mkdir -p /tmp/unhelm/mysql/mariadb-galera
       echo 'resources:' > /tmp/unhelm/mysql/mariadb-galera/kustomization.yaml
       helm template ystack bitnami/mariadb-galera -f mysql/mariadb-galera.yaml --namespace unhelm-namespace-placeholder --output-dir /tmp/unhelm/mysql | sed 's|wrote /tmp/unhelm/mysql/mariadb-galera/|- ./|'  | tee -a /tmp/unhelm/mysql/mariadb-galera/kustomization.yaml
+      # Opinions, https://github.com/Yolean/kubernetes-mysql-cluster/pull/35
+      sed -i.org 's/\butf8/utf8mb4/' /tmp/unhelm/mysql/mariadb-galera/templates/configmap.yaml
       # Your Kustomize base must override:
       grep -rn unhelm-namespace-placeholder /tmp/unhelm/mysql
       set +x

mysql/mariadb-galera/templates/configmap.yaml

@@ -28,9 +28,9 @@ data:
     
     ## Character set
     ##
-    collation_server=utf8_unicode_ci
-    init_connect='SET NAMES utf8'
-    character_set_server=utf8
+    collation_server=utf8mb4_unicode_ci
+    init_connect='SET NAMES utf8mb4'
+    character_set_server=utf8mb4
     
     ## MyISAM
     ##