fix(ci): build the workspace packages before the machine test

The machine workflow's end-to-end test failed at "==> encoding inputs" with
ERR_MODULE_NOT_FOUND for @cartesi/codec/dist/index.js.

test/machine/{encode-inputs,verify-outputs}.mjs import @cartesi/codec, a
workspace package built from source, but nothing built it: `pnpm i` does not
build, and run.sh's `pnpm run build` invokes @cartesi/rollup's own tsdown script,
which covers only its own dist. The ci workflow is unaffected because `pnpm test`
goes through turbo, whose test:run depends on build, which depends on ^build.

Build the dependency graph in the workflow, before the test runs, leaving run.sh
to assume its packages are already built.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bp4RNPL7aZprKdXzcuJ98s

Author: claude

.github/workflows/machine.yaml

@@ -38,6 +38,9 @@ jobs:
             - name: Install Dependencies
               run: pnpm i
 
+            - name: Build
+              run: pnpm build --filter @cartesi/rollup
+
             # libcmt bundles the `cmio` ioctl ABI since machine-guest-tools
             # 0.18.0, so the Cartesi Linux headers are no longer needed here.
             - name: Install riscv64 cross toolchain