Pass through the Sentry DSN if available

Author: microbit-matt-hillsdon

.github/workflows/build.yml

@@ -46,8 +46,9 @@ jobs:
         if: github.repository_owner == 'microbit-foundation'
       - run: npm run ci
         env:
-          REACT_APP_GA_MEASUREMENT_ID: ${{ secrets.GA_MEASUREMENT_ID }}
           REACT_APP_GA_COOKIE_PREFIX: ${{ secrets.REACT_APP_GA_COOKIE_PREFIX }}
+          REACT_APP_GA_MEASUREMENT_ID: ${{ secrets.GA_MEASUREMENT_ID }}
+          REACT_APP_SENTRY_DSN: ${{ secrets.REACT_APP_SENTRY_DSN }}
       - run: mkdir -p /tmp/app${PUBLIC_URL} && cp -r build/* /tmp/app${PUBLIC_URL} && npx serve --no-clipboard -l 3000 /tmp/app &
         if: env.STAGE == 'REVIEW' || env.STAGE == 'STAGING'
       - run: curl --insecure -4 --retry 7 --retry-connrefused http://localhost:3000 1>/dev/null