Fix corepack and pnpm installation in CircleCI

Author: arminmeh

.circleci/config.yml

@@ -80,6 +80,10 @@ commands:
         description: The version of React to use.
 
     steps:
+      - run:
+          name: Set npm registry public signing keys
+          command: |
+            echo "export COREPACK_INTEGRITY_KEYS='$(curl https://registry.npmjs.org/-/npm/v1/keys | jq -c '{npm: .keys}')'" >> $BASH_ENV
       - when:
           condition: << parameters.browsers >>
           steps: