Remove unnecessary OS install build step

Author: giggio

.github/workflows/build.yml

@@ -60,12 +60,6 @@ jobs:
       - run: npm run typecheck
         name: Type check
         if: startsWith(matrix.runner, 'ubuntu')
-      - run: |
-          set -euo pipefail
-          sudo apt-get update
-          sudo apt-get install -y libnss3
-        name: Install OS dependencies
-        if: startsWith(matrix.runner, 'ubuntu')
       - run: ./test-driver.sh
         name: Verify install
         shell: bash