build: Build with frozen lockfile (#5348)

Author: Luca Forstner

.github/workflows/build.yml

@@ -88,7 +88,7 @@ jobs:
           key: ${{ steps.compute_lockfile_hash.outputs.hash }}
       - name: Install dependencies
         if: steps.cache_dependencies.outputs.cache-hit == ''
-        run: yarn install --ignore-engines
+        run: yarn install --ignore-engines --frozen-lockfile
     outputs:
       dependency_cache_key: ${{ steps.compute_lockfile_hash.outputs.hash }}
 
@@ -332,7 +332,7 @@ jobs:
         env:
           NODE_VERSION: ${{ matrix.node }}
         run: |
-          [[ $NODE_VERSION == 8 ]] && yarn add --dev --ignore-engines --ignore-scripts --ignore-workspace-root-check ts-node@8.x
+          [[ $NODE_VERSION == 8 ]] && yarn add --dev --ignore-engines --ignore-scripts --ignore-workspace-root-check ts-node@8.10.2
           yarn test-ci
       - name: Compute test coverage
         uses: codecov/codecov-action@v1