message: Add Linux to combined package, zip it up properly.
diff: @@ -102,7 +102,7 @@ jobs:
  - cd $HOME/UE_4.26/Engine/Build/BatchFiles
  - ./RunUAT.sh BuildPlugin -Plugin="$CLONEDIR/CesiumForUnreal.uplugin" -Package="$CLONEDIR/../packages/CesiumForUnreal" -CreateSubFolder
  - cd "$CLONEDIR/../packages"
  - - zip ${BUILD_CESIUM_UNREAL_PACKAGE_NAME}.zip CesiumForUnreal/
  + - zip -r ${BUILD_CESIUM_UNREAL_PACKAGE_NAME}.zip CesiumForUnreal
  - aws s3 cp ${BUILD_CESIUM_UNREAL_PACKAGE_NAME}.zip s3://builds-cesium-unreal/
  - export PACKAGE_LINK=$(aws --region us-east-1 s3 presign s3://builds-cesium-unreal/${BUILD_CESIUM_UNREAL_PACKAGE_NAME}.zip --expires-in 315360000)
  - http POST "https://api.github.com/repos/${TRAVIS_REPO_SLUG}/statuses/${TRAVIS_COMMIT}" "Authorization:token ${GITHUB_TOKEN}" state=success context=plugin-package-linux "target_url=${PACKAGE_LINK}" --ignore-stdin
  @@ -116,6 +116,7 @@ jobs:
  - sudo apt-get install unzip zip awscli httpie
  script:
  - export CESIUM_UNREAL_VERSION=$(git describe)
  + - aws s3 cp s3://builds-cesium-unreal/CesiumForUnreal-linux-${CESIUM_UNREAL_VERSION}.zip .
  - aws s3 cp s3://builds-cesium-unreal/CesiumForUnreal-osx-${CESIUM_UNREAL_VERSION}.zip .
  - aws s3 cp s3://builds-cesium-unreal/CesiumForUnreal-windows-${CESIUM_UNREAL_VERSION}.zip .
  - mkdir -p build/package
  