refactor: move db_root_password to mariadb

It is only used by mariadb and not by postgres

Closes #34

compose.mariadb.yml

@@ -42,5 +42,10 @@ configs:
     name: ${STACK_NAME}_my_cnf_${MY_CNF_VERSION}
     file: my-tune.cnf
 
+secrets:
+  db_root_password:
+    external: true
+    name: ${STACK_NAME}_db_root_password_${SECRET_DB_ROOT_PASSWORD_VERSION}
+
 volumes:
   mariadb:

compose.yml

@@ -127,9 +127,6 @@ services:
       retries: 20
 
 secrets:
-  db_root_password:
-    external: true
-    name: ${STACK_NAME}_db_root_password_${SECRET_DB_ROOT_PASSWORD_VERSION}
   db_password:
     external: true
     name: ${STACK_NAME}_db_password_${SECRET_DB_PASSWORD_VERSION}