ci: Provide Inno Setup tools to some Windows CI jobs

.gitlab/.gitignore

@@ -3,6 +3,7 @@
 /bcc*
 /cmake*
 /ispc*
+/innosetup
 /jom
 /llvm*
 /mingw

.gitlab/ci/env_windows_vs2022_x64_ninja.ps1

@@ -1,3 +1,4 @@
 if ("$env:CMAKE_CI_NIGHTLY" -eq "true") {
+  . ".gitlab/ci/innosetup-env.ps1"
   . ".gitlab/ci/ispc-env.ps1"
 }

.gitlab/ci/innosetup-env.ps1

@@ -0,0 +1,4 @@
+$pwdpath = $pwd.Path
+& "$pwsh" -File ".gitlab/ci/innosetup.ps1"
+Set-Item -Force -Path "env:PATH" -Value "$pwdpath\.gitlab\innosetup;$env:PATH"
+ISCC 2>$null | Select -First 1

.gitlab/ci/innosetup.ps1

@@ -0,0 +1,20 @@
+$erroractionpreference = "stop"
+
+$version = "6.2.2-1"
+$sha256sum = "34D5311070678617424628A88C8A7F7BE41157B1A59112F9DFDA1D7EFD4469CC"
+$filename = "innosetup-$version"
+$tarball = "$filename.zip"
+
+$outdir = $pwd.Path
+$outdir = "$outdir\.gitlab"
+$ProgressPreference = 'SilentlyContinue'
+Invoke-WebRequest -Uri "https://cmake.org/files/dependencies/internal/$tarball" -OutFile "$outdir\$tarball"
+$hash = Get-FileHash "$outdir\$tarball" -Algorithm SHA256
+if ($hash.Hash -ne $sha256sum) {
+    exit 1
+}
+
+Add-Type -AssemblyName System.IO.Compression.FileSystem
+[System.IO.Compression.ZipFile]::ExtractToDirectory("$outdir\$tarball", "$outdir")
+Move-Item -Path "$outdir\$filename" -Destination "$outdir\innosetup"
+Remove-Item "$outdir\$tarball"