fix missing key on apt-get (#1440)

see https://github.com/electron-userland/electron-builder/issues/5485#issuecomment-749244332

.circleci/config.yml

@@ -61,6 +61,7 @@ commands:
         type: string
         default: ""
     steps:
+      - run: wget -qO - https://download.opensuse.org/repositories/Emulators:/Wine:/Debian/xUbuntu_18.04/Release.key | apt-key add -
       - run: apt-get update && apt-get -y install << parameters.apt_opts >>
       - run: npm ci