Add a Windows debug build job to GitLab CI

Add a Visual Studio build job using the "Debug" build configuration to
GitLab CI without enabling it for every pipeline as it takes about twice
as long to complete as its "Release" counterpart.

(cherry picked from commit 12564928a7)

.gitlab-ci.yml

@@ -195,6 +195,35 @@ stages:
     untracked: true
     expire_in: "1 week"
 
+.windows_build: &windows_build_job
+  stage: build
+  tags:
+    - windows
+    - amd64
+  script:
+    - 'Push-Location "C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Auxiliary/Build"'
+    - '& cmd.exe /C "vcvarsall.bat x64 & set" | Foreach-Object { if ($_ -match "(.*?)=(.*)") { Set-Item -force -path "Env:\$($matches[1])" -value "$($matches[2])" } }'
+    - 'Pop-Location'
+    - 'Set-Location win32utils'
+    - '& "C:/Strawberry/perl/bin/perl.exe" Configure
+         "with-tools-version=15.0"
+         "with-platform-toolset=v141"
+         "with-platform-version=10.0.17763.0"
+         "with-vcredist=C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Redist/MSVC/14.16.27012/vcredist_x64.exe"
+         "with-openssl=C:/OpenSSL"
+         "with-libxml2=C:/libxml2"
+         "without-python"
+         "with-system-tests"
+         x64'
+    - 'Set-Item -path "Env:CL" -value "/MP$([Math]::Truncate($BUILD_PARALLEL_JOBS/2))"'
+    - '& msbuild.exe /maxCpuCount:2 /t:Build /p:Configuration=$VSCONF bind9.sln'
+  dependencies: []
+  needs:
+    - autoreconf:sid:amd64
+  artifacts:
+    untracked: true
+    expire_in: "1 week"
+
 .setup_interfaces: &setup_interfaces |
     if [ "$(id -u)" -eq "0" ]; then
       sh -x bin/tests/system/ifconfig.sh up;
@@ -920,36 +949,10 @@ unit:nolibtool:sid:amd64:
 # Jobs for Visual Studio 2017 builds on Windows (amd64)
 
 msvc:windows:amd64:
+  <<: *windows_build_job
   <<: *default_triggering_rules
-  stage: build
-  tags:
-    - windows
-    - amd64
   variables:
     VSCONF: Release
-  script:
-    - 'Push-Location "C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Auxiliary/Build"'
-    - '& cmd.exe /C "vcvarsall.bat x64 & set" | Foreach-Object { if ($_ -match "(.*?)=(.*)") { Set-Item -force -path "Env:\$($matches[1])" -value "$($matches[2])" } }'
-    - 'Pop-Location'
-    - 'Set-Location win32utils'
-    - '& "C:/Strawberry/perl/bin/perl.exe" Configure
-         "with-tools-version=15.0"
-         "with-platform-toolset=v141"
-         "with-platform-version=10.0.17763.0"
-         "with-vcredist=C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Redist/MSVC/14.16.27012/vcredist_x64.exe"
-         "with-openssl=C:/OpenSSL"
-         "with-libxml2=C:/libxml2"
-         "without-python"
-         "with-system-tests"
-         x64'
-    - 'Set-Item -path "Env:CL" -value "/MP$([Math]::Truncate($BUILD_PARALLEL_JOBS/2))"'
-    - '& msbuild.exe /maxCpuCount:2 /t:Build /p:Configuration=$VSCONF bind9.sln'
-  dependencies: []
-  needs:
-    - autoreconf:sid:amd64
-  artifacts:
-    untracked: true
-    expire_in: "1 week"
 
 system:msvc:windows:amd64:
   stage: system
@@ -978,3 +981,11 @@ system:msvc:windows:amd64:
   only:
     - tags
     - web
+
+msvc-debug:windows:amd64:
+  <<: *windows_build_job
+  variables:
+    VSCONF: Debug
+  only:
+    - tags
+    - web