fix: installation via volta broken due to symbolic links pointing to tmp file

[mrloop]

The PR uses a relative path for symbolic link

See https://github.com/sst/opencode/issues/197 Fix verified locally by running local npm registry:

cat > ./verdaccio.local.yaml <<'YAML'
max_body_size: 200mb

storage: ./storage
uplinks:
  npmjs:
    url: https://registry.npmjs.org/
packages:
  "@*/*":
    access: $all
    publish: $all
    proxy: npmjs
  "**":
    access: $all
    publish: $all
    proxy: npmjs
YAML

npx verdaccio@latest --listen 4873 --config ./verdaccio.local.yaml

And publishing opencode to that:

OPENCODE_VERSION="1.0.0-local" OPENCODE_DRY="false" bun run script/publish.ts

The packages/opencode/script/publish.ts was updated to publish to local registry by appending --registry http://localhost:4873 to the bun publish commands.

Volta was then used to install from the local registry:

NPM_CONFIG_REGISTRY=http://localhost:4873 npm_config_registry=http://localhost:4873 volta install [email protected]

[mrloop]