fix(ci): try setting work dir for gulp like this

Author: ChronosSF

.github/workflows/build-sb.yml

@@ -14,7 +14,7 @@ jobs:
   # This workflow contains a single job called "build"
   build:
     # The type of runner that the job will run on
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
 
     strategy:
       matrix:
@@ -37,7 +37,6 @@ jobs:
         working-directory: ./browser
 
       - name: Build the samples browser to ensure it compiles
-        run: npm run build
-        working-directory: ./browser
+        run: cd ./browser & npm run build
         env:
           NODE_OPTIONS: "--max_old_space_size=4096"