skip win-RS1 on PRs unless the checkbox is checked

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>
Signed-off-by: Tibor Vass <tibor@docker.com>
(cherry picked from commit 039eb05ac87d52fe0b268c090f137eaa14754eed)
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>
Upstream-commit: 36fc8f580947bae899a68171743dce5965a0c08d
Component: engine

Author: andrewhsu

components/engine/Jenkinsfile

@@ -12,7 +12,7 @@ pipeline {
         booleanParam(name: 'amd64', defaultValue: true, description: 'amd64 (x86_64) Build/Test')
         booleanParam(name: 's390x', defaultValue: true, description: 'IBM Z (s390x) Build/Test')
         booleanParam(name: 'ppc64le', defaultValue: true, description: 'PowerPC (ppc64le) Build/Test')
-        booleanParam(name: 'windowsRS1', defaultValue: true, description: 'Windows 2016 (RS1) Build/Test')
+        booleanParam(name: 'windowsRS1', defaultValue: false, description: 'Windows 2016 (RS1) Build/Test')
         booleanParam(name: 'windowsRS5', defaultValue: true, description: 'Windows 2019 (RS5) Build/Test')
         booleanParam(name: 'skip_dco', defaultValue: false, description: 'Skip the DCO check')
     }
@@ -689,7 +689,11 @@ pipeline {
                 stage('win-RS1') {
                     when {
                         beforeAgent true
-                        expression { params.windowsRS1 }
+                        // Skip this stage on PRs unless the windowsRS1 checkbox is selected
+                        anyOf {
+                            not { changeRequest() }
+                            expression { params.windowsRS1 }
+                        }
                     }
                     environment {
                         DOCKER_BUILDKIT        = '0'