gitlab-ci: wire up Visual Studio build with Meson

Add a new job that builds and tests Meson-based builds with Visual
Studio. While the build job is mandatory, the test job is marked as
"manual" so that it doesn't run by default. We already have a bunch of
Windows-based jobs, and the computational overhead that these cause is
simply out of proportion to run the test suite twice.

A couple notes:

  - We disable Perl. This is because we pick up Perl from Git for
    Windows, which outputs different paths ("/c/" instead of "C:\") than
    what we expect in our tests.

  - We don't use the Git for Windows SDK. Instead, the build only
    depends on Visual Studio, Meson and Git for Windows. All the other
    dependencies like curl, pcre2 and zlib get pulled in and compiled
    automatically by Meson and thus do not have to be provided by the
    system.

  - We open-code "ci/run-test-slice.sh". This is because we only have
    direct access to PowerShell, so we manually implement the logic.
    There is an upstream pull request for the Meson build system [1] to
    implement test slicing in Meson directly.

All tests are passing.

[1]: mesonbuild/meson#14092

Signed-off-by: Patrick Steinhardt <[email protected]>

.gitlab-ci.yml

@@ -149,6 +149,42 @@ test:mingw64:
     - git-sdk/usr/bin/bash.exe -l -c 'ci/print-test-failures.sh'
   parallel: 10
 
+.msvc-meson:
+  tags:
+    - saas-windows-medium-amd64
+  before_script:
+    - choco install -y git meson ninja openssl
+    - Import-Module $env:ChocolateyInstall\helpers\chocolateyProfile.psm1
+    - refreshenv
+    # The certificate store for Python on Windows is broken and fails to fetch
+    # certificates, see https://bugs.python.org/issue36011. Work around the
+    # issue by importing cetrificates manually.
+    - Invoke-WebRequest https://curl.haxx.se/ca/cacert.pem -OutFile cacert.pem
+    - openssl pkcs12 -export -nokeys -in cacert.pem -out certs.pfx -passout "pass:"
+    - Import-PfxCertificate -CertStoreLocation Cert:\LocalMachine\Root -FilePath certs.pfx
+
+build:msvc-meson:
+  extends: .msvc-meson
+  stage: build
+  script:
+    - meson setup build -Dperl=disabled
+    - meson compile -C build
+  artifacts:
+    paths:
+      - build
+
+test:msvc-meson:
+  extends: .msvc-meson
+  stage: test
+  when: manual
+  timeout: 6h
+  needs:
+    - job: "build:msvc-meson"
+      artifacts: true
+  script:
+    - meson test -C build --list | Select-Object -Skip 1 | Select-String .* | Group-Object -Property { $_.LineNumber % $Env:CI_NODE_TOTAL + 1 } | Where-Object Name -EQ $Env:CI_NODE_INDEX | ForEach-Object { meson test -C build --no-rebuild $_.Group }
+  parallel: 10
+
 test:fuzz-smoke-tests:
   image: ubuntu:latest
   stage: test