conditional macOS build

.vsts-ci.yml

@@ -48,7 +48,7 @@ jobs:
       ArtifactType: Container
 
 - job: macos
-
+  condition: ne(variables['iOSSigning.Certificate'], '')
   pool:
     vmImage: 'macOS-10.13'
 
@@ -56,6 +56,18 @@ jobs:
   - checkout: self
     clean: true
 
+  - task: InstallAppleCertificate@2
+    displayName: 'Install an Apple certificate'
+    inputs:
+      certSecureFile: '$(iOSSigning.Certificate)'
+      certPwd: '$(iOSSigning.CertificatePwd)'
+      signingIdentity: '$(iOSSigning.CertificateIdentity)'
+
+  - task: InstallAppleProvisioningProfile@1
+    displayName: 'Install an Apple provisioning profile'
+    inputs:
+      provProfileSecureFile: '$(iOSSigning.ProvisioningProfile)'
+
   - task: MSBuild@1
     inputs:
       solution: '$(build.sourcesdirectory)/Samples/XamlUIBasics/cs/AppUIBasics.iOS/AppUIBasics.iOS.csproj'