yarn install fails with no yarn installed

[nickfrosty]

when running anchor init to scaffold a new anchor workspace the command fails on the yarn install step with the following error:

Error: yarn install failed: No such file or directory (os error 2)

to note, yarn is not installed on this system since it was just freshly setup with all the usual local solana tooling. at a quick glance of the anchor code, I see it attempts to fallback to npm for installing the node modules, but for some reason it is not for me

system details:

• ubuntu
• avm 0.30.1
• anchor 0.30.1

[nickfrosty]

looks like this might be related to this issue: #3281

[acheroncrypto]

This should be fixed when we make npm the default (see #2881).

[nickfrosty]

amazing!

[arihantbansal]

@nickfrosty You can now pass in the package manager you want to use, see #3328