Add editorconfig-checker workflow

Add yml style to editorconfig
Add markdown styling to editorconfig

Signed-off-by: Christian König <ckoenig@posteo.de>

advanced/Scripts/database_migration/gravity/11_to_12.sql

@@ -16,4 +16,4 @@ CREATE TRIGGER tr_group_zero AFTER DELETE ON "group"
 
 UPDATE info SET value = 12 WHERE property = 'version';
 
-COMMIT;
+COMMIT;