Support yarn during block release

[xavdid]

I tried to release my block after having installed dependencies locally with yarn and got the following:

% block release
building
copying package.json file
copying package-lock.json file

❌ Error: package-lock.json does not exist!
Failed to build the block code!

This is using block v0.0.55.

Related, is the code for the CLI itself available on Github? It doesn't seem to be in this repo.

[arvinxx]

I want it too.

[stemail23]

I would also like this. I have to work around by including an explicit npm install in our otherwise yarn-based CI deployment.