ioutil has been deprecated since go 1.16, this fixes all of the
deprecated functions we are using:
ioutil.ReadFile -> os.ReadFile
ioutil.ReadAll -> io.ReadAll
ioutil.WriteFile -> os.WriteFile
ioutil.TempFile -> os.CreateTemp
ioutil.TempDir -> os.MkdirTemp
All of the above are a simple name change, the function arguments and
results are exactly the same as before.
ioutil.ReadDir -> os.ReadDir
now returns a os.DirEntry but the IsDir and Name functions work the
same. The difference is that the FileInfo must be retrieved with the
Info() function which can also return an error.
These were identified by running:
golangci-lint run --build-tags=integration ./...
weldr's store is quite complex and handled serialization itself. Move
that part out into a separate package `jsondb`.
This package is more generic than the store needs: it can write an
arbitrary amount of JSON documents while the store only needs one:
state.json. This is in preparation for future work, which introduces a
queue package that builds on top of `jsondb`.
