Drone: Don't build on Windows for PRs (#28663)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

.drone.yml

@@ -230,32 +230,6 @@ trigger:
   event:
   - pull_request
 
----
-kind: pipeline
-type: docker
-name: windows-pr
-
-platform:
-  os: windows
-  arch: amd64
-  version: 1809
-
-steps:
-- name: identify-runner
-  image: mcr.microsoft.com/windows:1809
-  commands:
-  - echo $env:DRONE_RUNNER_NAME
-
-- name: initialize
-  image: grafana/ci-wix:0.1.1
-  commands:
-  - $$ProgressPreference = "SilentlyContinue"
-  - Invoke-WebRequest https://grafana-downloads.storage.googleapis.com/grafana-build-pipeline/v0.5.20/windows/grabpl.exe -OutFile grabpl.exe
-
-trigger:
-  event:
-  - pull_request
-
 ---
 kind: pipeline
 type: docker

scripts/pr.star

@@ -19,7 +19,6 @@ load(
     'build_docker_images_step',
     'postgres_integration_tests_step',
     'mysql_integration_tests_step',
-    'get_windows_steps',
     'benchmark_ldap_step',
     'ldap_service',
     'integration_test_services',
@@ -50,7 +49,6 @@ def pr_pipelines(edition):
         postgres_integration_tests_step(),
         mysql_integration_tests_step(),
     ]
-    windows_steps = get_windows_steps(edition=edition, ver_mode=ver_mode)
     if edition == 'enterprise':
         steps.append(benchmark_ldap_step())
         services.append(ldap_service())
@@ -62,8 +60,4 @@ def pr_pipelines(edition):
             name='test-pr', edition=edition, trigger=trigger, services=services, steps=steps,
             ver_mode=ver_mode,
         ),
-        pipeline(
-            name='windows-pr', edition=edition, trigger=trigger, steps=windows_steps, platform='windows',
-            ver_mode=ver_mode,
-        ),
     ]