Drone: Trigger Enterprise PR checks for OSS PRs (#47176)

* 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

scripts/drone/pipelines/main.star

@@ -129,7 +129,7 @@ def get_steps(edition):
     ]
     build_steps = [
         trigger_test_release(),
-        enterprise_downstream_step(edition=edition),
+        enterprise_downstream_step(edition=edition, ver_mode=ver_mode),
         build_backend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_package_step(edition=edition, ver_mode=ver_mode),

scripts/drone/pipelines/pr.star

@@ -32,6 +32,7 @@ load(
     'validate_scuemata_step',
     'ensure_cuetsified_step',
     'test_a11y_frontend_step',
+    'enterprise_downstream_step',
 )
 
 load(
@@ -118,6 +119,7 @@ def pr_pipelines(edition):
         yarn_install_step(),
     ]
     build_steps = [
+        enterprise_downstream_step(edition=edition, ver_mode=ver_mode),
         build_backend_step(edition=edition, ver_mode=ver_mode, variants=variants),
         build_frontend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_package_step(edition=edition, ver_mode=ver_mode),