Fix metafile copying when lock file is not found

[Julien-R44]

So again ahah, we have a problem with the metafiles copying : if the lockfile does not exist, copying the meta files will fail. To recap, here's the problem I encountered:

• I tried to build my Adonis project
• The metafiles were not copied, even the package.json file was missing.
• I investigated and noticed that it was trying to copy package-lock.json to the build folder. However, I'm using pnpm so I don't have a package-lock.json file.

The problem is that we copy the metafiles + package.json + lockfile in a single call to cpy: https://github.com/adonisjs/assembler/blob/fix/metafiles-cpy/src/bundler.ts#L223

Then we ignore ENOENT errors:
https://github.com/adonisjs/assembler/blob/fix/metafiles-cpy/src/bundler.ts#L105

And, when trying to copy metafiles + package.json + lockfile, since the lock file is missing, cpy will just throw an error and not copy anything.

So i am not sure how we should handle this, hence my PR with just a test that showcase the error.
I've opened a PR to the core that adds automatic detection of the package manager, which help to avoiding this error

Also, I wonder if we shouldn't find an alternative to cpy given the message added to their README: https://github.com/sindresorhus/cpy/releases/tag/v11.0.0

This package has a lot of problems and I unfortunately don't have time to fix them. I would recommend against using this package until these problems are resolved. Help welcome (see the issue tracker).

Feel free to give any directive and I can implement a fix

[thetutlage]

How about we then drop cpy and use our custom implementation? We need a way to expand the glob pattern and then copy files maintaining the directory structure. I think, it shouldn't be that hard

[Julien-R44]

Yes, agree. Let's do that

[Julien-R44]

Should be all good

[RomainLanz]

You still have conflicts, seems you have to rebase

[Julien-R44]

what the fuck did I do

[Julien-R44]

Okay looks like we can't rebase this PR, but we can squash it. Idk what the hell i've done
Let's squash it