Ensure SigningCertificate variable is set so that WiX detects it

Author: zooba

windows-release/azure-pipelines.yml

@@ -85,6 +85,10 @@ parameters:
   displayName: "Produce EXE/MSI installer"
   type: boolean
   default: true
+- name: TestMSI
+  displayName: "Run EXE/MSI installer tests"
+  type: boolean
+  default: true
 - name: DoPyManager
   displayName: "Produce PyManager package"
   type: boolean
@@ -248,7 +252,7 @@ stages:
     jobs:
     - ${{ if eq(parameters.DoEmbed, 'true') }}:
       - template: stage-test-embed.yml
-    - ${{ if eq(parameters.DoMSI, 'true') }}:
+    - ${{ if and(eq(parameters.DoMSI, 'true'), eq(parameters.TestMSI, 'true')) }}:
       - template: stage-test-msi.yml
         parameters:
           DoFreethreaded: ${{ parameters.DoFreethreaded }}

windows-release/msi-steps.yml

@@ -85,6 +85,8 @@ steps:
         AZURE_TENANT_ID: $(TrustedSigningTenantId)
         AZURE_CLIENT_ID: $(TrustedSigningClientId)
         AZURE_CLIENT_SECRET: $(TrustedSigningSecret)
+        # Only need the variable here for msi.props to detect
+        SigningCertificate: ${{ parameters.SigningCertificate }}
 
   - ${{ each b in parameters.Bundles }}:
     - script: |
@@ -101,6 +103,8 @@ steps:
           AZURE_TENANT_ID: $(TrustedSigningTenantId)
           AZURE_CLIENT_ID: $(TrustedSigningClientId)
           AZURE_CLIENT_SECRET: $(TrustedSigningSecret)
+          # Only need the variable here for msi.props to detect
+          SigningCertificate: ${{ parameters.SigningCertificate }}
 
   - powershell: |
       del $env:ResponseFile -ErrorAction Continue