dashboard docker build fails on ZFS

[sublimal]

Not sure this needs to be fixed here. Mostly adding as an FYI in case someone else comes across it.

On ZFS supported systems Docker build will fail with :

ERR_PNPM_EAGAIN  EAGAIN: resource temporarily unavailable, copyfile [...]

on step

rota/dashboard/Dockerfile

Line 10 in 52a9be7

RUN pnpm install --frozen-lockfile

Workaround, change to:

RUN pnpm install --frozen-lockfile --package-import-method=hardlink

Relates pnpm/pnpm#7024 (comment)
pnpm version pin in Dockerfile will need updating if fixed upstream.