feat(migration): update blog schema to add new fields and improve migration handling

docker/entrypoint.sh

@@ -29,8 +29,11 @@ if [ "${RUN_INIT:-1}" = "1" ]; then
     php bin/console cache:clear --no-warmup
     php bin/console cache:warmup
 
-    # Apply pending migrations. --all-or-nothing wraps them in a transaction.
-    php bin/console doctrine:migrations:migrate --all-or-nothing --no-interaction
+    # Apply pending migrations. NOT --all-or-nothing: MariaDB auto-commits on DDL
+    # (ALTER TABLE), which releases the transaction's savepoint mid-migration and
+    # then fails with "SAVEPOINT DOCTRINE_2 does not exist". Same reason liara_pre_start.sh
+    # omits it. DDL can't be rolled back on MariaDB anyway, so the flag only adds breakage.
+    php bin/console doctrine:migrations:migrate --no-interaction
 fi
 
 exec "$@"