Try bash on HyperV

.gitlab-ci-build.yml.in

@@ -79,14 +79,10 @@ hyperv-iso.amd64:
     tag: hyperv
   parallel:
     matrix: []
-  script:
-    - echo $env:COMMAND > build.ps1
-    - echo 'if (-not $?) { throw "Error in build"}' >> build.ps1
-    - pwsh .\build.ps1
   after_script: |-
-    if ( "$CI_JOB_STATUS" -eq "success" ) {
+    if [ "$CI_JOB_STATUS" == "success" ]; then
       xonsh test.xsh
-    }
+    fi
 
 "Create release":
   stage: release