Avoid need for build directory

.github/workflows/main.yml

@@ -18,11 +18,14 @@ jobs:
         with:
           node-version: '10.18.1'
 
+      - name: Install dependencies
+        run: |
+          node common/scripts/install-run-rush.js install
+        shell: bash
+
       - name: Build
         run: |
-          cd build
-          npm install
-          npm run build-ci
+          node common/scripts/install-run-rush.js build
         shell: bash
 
       - name: Prepare artifacts
@@ -55,11 +58,14 @@ jobs:
           node-version: '10.18.1'
 
       # We have to build the dependencies in `lib` before running any tests.
+      - name: Install dependencies
+        run: |
+          node common/scripts/install-run-rush.js install
+        shell: bash
+
       - name: Build
         run: |
-          cd build
-          npm install
-          npm run build-ci
+          node common/scripts/install-run-rush.js build
         shell: bash
 
       - name: Lint