ci/tests: fix Azure Pipelines not running Windows containers

Workaround posted here: microsoft/azure-pipelines-agent#2864

Assisted-by: Simon Chalifoux
Assisted-by: Tommy Petty
Fixes #5117
Closes #5129

diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 42dd83c5b02bc37369edcc21474d706ee61e9250..3f0025b7bf915f7fbb6cf3ee8f6a5d852a5e8625 100644 (file)
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -239,6 +239,8 @@ stages:
 
 - stage: windows
   dependsOn: []
+  variables:
+    agent.preferPowerShellOnContainers: true
   jobs:
   - job: windows_msys2_mingw32_debug_openssl
     displayName: msys2 mingw32 debug openssl