refs https://github.com/TryGhost/Toolbox/issues/309
refs 2bfd8f8b7e
- we've previously had issues when dropping a column on `posts`
because it's a large table and it can take a veeeeeeery long time with
the default SQL produced by Knex
- we found a magic incantation that makes it super speedy (context in
commit above) => `, algorithm=copy`
- for that migration, we did it all manually but we can now change the
utility to always append this to the generated SQL so we don't have to
think about the specific table size when adding or dropping columns
- this changes the `addColumn` and `dropColumn` utilities to append the
string to SQL in MySQL, or just executes the SQL for SQLite
d8e58b53d0