Build both sticker creator and main app in CI

.travis.yml

@@ -13,7 +13,7 @@ script:
   - yarn lint
   - yarn lint-deps
   - yarn prepare-beta-build
-  - $(yarn bin)/electron-builder --config.extraMetadata.environment=$SIGNAL_ENV --config.mac.bundleVersion='$TRAVIS_BUILD_NUMBER' --publish=never --config.directories.output=release
+  - yarn build
   - ./travis.sh
 env:
   global:

appveyor.yml

@@ -21,7 +21,7 @@ build_script:
   - type package.json | findstr /v certificateSubjectName > temp.json
   - move temp.json package.json
   - yarn prepare-beta-build
-  - node_modules\.bin\electron-builder --config.extraMetadata.environment=%SIGNAL_ENV% --publish=never --config.directories.output=release
+  - yarn build
 
 test_script:
   - node build\grunt.js test