Automatically obtain required mods in test

Build the clusterio_lib mod from source and download and copy the
subspace_storage mod used for testing if it's not present in the mods
directory.  This removes a manual step needed to run tests on a new
clone of the repository.

.github/workflows/node.js.yml

@@ -26,8 +26,6 @@ jobs:
         node-version: ${{ matrix.node-version }}
     - run: pnpm i --no-optional --no-frozen-lockfile
     - run: wget -q -O factorio.tar.gz https://www.factorio.com/get-download/latest/headless/linux64 && tar -xf factorio.tar.gz && rm factorio.tar.gz
-    - run: node packages/lib/build_mod --source-dir packages/host/lua/clusterio_lib --output-dir temp/test/mods
-    - run: wget -q -O temp/test/mods/subspace_storage_1.99.8.zip -L https://github.com/clusterio/subspace_storage/releases/download/1.99.6/subspace_storage_1.99.8.zip
     - name: Run tests
       if: ${{ matrix.node-version != '18.x' }}
       run: pnpm test