Replace npm and lerna with pnpm

Save disk space, time and sanity by replacing npm and lerna with pnpm.
This is more performant and doesn't have developer experience ruining
bugs like npm link removing all previous links before creating the
requested one.

.github/workflows/node.js.yml

@@ -21,18 +21,17 @@ jobs:
       uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node-version }}
-    - run: npm i --no-optional
+    - run: pnpm i --no-optional
     - 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: npx lerna bootstrap --hoist
     - run: node packages/lib/build_mod --source-dir packages/slave/lua/clusterio_lib --output-dir temp/test/sharedMods
     - run: wget -q -O temp/test/sharedMods/subspace_storage_1.99.8.zip -L https://github.com/clusterio/subspace_storage/releases/download/1.99.6/subspace_storage_1.99.8.zip
-    - run: npx lerna run build
+    - run: pnpm run -r --if-present build
     - name: Run tests
       if: ${{ matrix.node-version != '12.x' }}
-      run: npm test
+      run: pnpm test
     - name: Run coverage
       if: ${{ matrix.node-version == '12.x' }}
-      run: npm run ci-cover
+      run: pnpm run ci-cover
     - name : Upload coverage to Codecov
       if: ${{ matrix.node-version == '12.x' }}
       uses: codecov/codecov-action@v2
@@ -46,6 +45,5 @@ jobs:
     - uses: actions/setup-node@v2
       with:
         node-version: 16.x
-    - run: npm i --no-optional
-    - run: npx lerna bootstrap --hoist
-    - run: npm run lint
+    - run: pnpm i --no-optional
+    - run: pnpm run lint