* Traverse symlinks when resolving migrations
When enumerating the source directory seeking migration files, `sqlx`
ignores entries that aren't files. This was previously reported as #614
and fixed in #985 but apparently regressed somewhere along the way. This
commit reintroduces the fix from #985 to the current implementation: use
`std::fs::metadata` instead of `std::fs::DirEntry::metadata`. The former
is documented to traverse symlinks; the latter does not.
* add migrations_symlink test
* fix: ensure migration progress is not lost for PG
Fixes#1966.
* fix: ensure migration progress is not lost for sqlite
This is similar to #1966.
* fix: ensure reverse migration progress is not lost for PG
See #1966.
* fix: ensure reverse migration progress is not lost for sqlite
See #1966.
* fix: ensure migration progress is not lost for mysql
This is similar to #1966.
* fix: ensure reverse migration progress is not lost for mysql
See #1966.
* test: check migration type as well
* test: extend migrations testing
* fix: work around MySQL implicit commits
* refactor: simplify migration testing
* fix(macros): tell the compiler about external files/env vars to watch
closes#663closes#681
* feat(cli): add `migrate` subcommand for generating a build script
suggest embedding migrations on `sqlx migrate add` in a new project
