* Drone: add enterprise-init-downstream step
* fixes
* Add OSS_PULL_REQUEST env variable for downstream builds
* sign Drone config
* Update .drone.yml
* use test grabpl
* test without init step
* fix downstream branch
* unknown branch test
* use drone-downstream test image
* revert latest changes
* update Drone and add GH workflow
* fix PR number
* Run Enterprise PR check only on PRs targeting main or release branch
* update repository dispatch action
* remove test data
* update grabpl version