Exploration of PNPM

[area]

For whatever reason - possibly with the move to Node 20 - we're having real issues with a single lockfile being installable on Linux and OSX. This comes down to fsevents being only needed on OSX (and therefore optional elsewhere) and npm having an issue with that - see npm/cli#4828 for the ongoing issue related to this.

I've explored what it would look like if we moved to pnpm. As well as the lockfile issue being resolved (I think), a couple of nice side benefits:

• Faster install times, which has been an issue with the CDapp dev environment
• A 'proper' way to patch @nomiclabs/truffle-contract rather than a postinstall call to sed

npm i -g pnpm@8 to install, and then just use pnpm instead of npm to call everything is all that should be necessary.

NB based on top of maint/docker-file-builds.

[area]

As an addendum, after speaking to Chris, the resident Node guru:

• He uses pnpm for ColonyJS, and is thinking of moving the dapp to it, so supports this 'wholeheartedly'.
• He uses v8 there (as I do here), and will only look to move to v9 once it is more mature

[kronosapiens]

I've been dealing with this issue for a while (~3 months) when we were on node@14. I went down a few rabbit holes, but the only fix which consistently worked in CI was manually editing package-lock.json to add "linux" to the os field:

      "os": [
        "darwin",
        "linux" // Manually add this
      ],

This behavior could conceivably be incorporated into a post-commit hook using sed.

[kronosapiens]

Looks reasonable to me

[area]

Don't want this merged yet (requires JoinColony/colonyCDapp#2316), but interested in a review.

[kronosapiens]

Looks reasonable, the patching functionality is quite interesting

[area]

The versioning check script is broken, but not as a result of this PR so don't intend for it to hold it up.