[PATCH 1/4] ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

The minimal Git for Windows SDK already supplies Git and GCC. The
MinGW Makefile build needs the GNU Rust toolchain, not another Git
installation or Meson.

Let the dependency installer serve this configuration while keeping
the existing package set for MSVC builds.

Assisted-by: GPT-6
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 ci/install-dependencies.ps1 | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/ci/install-dependencies.ps1 b/ci/install-dependencies.ps1
index e3b367fa54..8c68fb0cfc 100755
--- a/ci/install-dependencies.ps1
+++ b/ci/install-dependencies.ps1
@@ -1,5 +1,6 @@
 param(
-    [string]$DownloadDirectory = '.dependencies'
+    [string]$DownloadDirectory = '.dependencies',
+    [switch]$Mingw
 )
 
 $ErrorActionPreference = 'Stop'
@@ -41,6 +42,17 @@ function Invoke-Installer {
     }
 }
 
+$rustTarget = if ($Mingw) { 'gnu' } else { 'msvc' }
+$rustMsi = Get-Installer "rust-$rustTarget.msi" (
+    "https://static.rust-lang.org/dist/" +
+    "rust-$RustVersion-x86_64-pc-windows-$rustTarget.msi")
+Invoke-Installer msiexec.exe @('/i', $rustMsi, 'INSTALLDIR=C:\Rust',
+    'ADDLOCAL=Rustc,Cargo,Std', '/quiet', '/norestart')
+
+if ($Mingw) {
+    return
+}
+
 $gitAssetVersion = $GitVersion -replace '\.windows\.\d+$', ''
 $gitInstaller = Get-Installer "Git-Installer.exe" `
     "https://github.com/git-for-windows/git/releases/download/v$GitVersion/PortableGit-$gitAssetVersion-64-bit.7z.exe"
@@ -49,7 +61,3 @@ Invoke-Installer $gitInstaller @('-y', '-o"C:\Program Files\Git"')
 $mesonMsi = Get-Installer "meson.msi" `
     "https://github.com/mesonbuild/meson/releases/download/$MesonVersion/meson-$MesonVersion-64.msi"
 Invoke-Installer msiexec.exe @('/i', $mesonMsi, 'INSTALLDIR=C:\Meson', '/quiet', '/norestart')
-
-$rustMsi = Get-Installer "rust.msi" `
-    "https://static.rust-lang.org/dist/rust-$RustVersion-x86_64-pc-windows-msvc.msi"
-Invoke-Installer msiexec.exe @('/i', $rustMsi, 'INSTALLDIR=C:\Rust', 'ADDLOCAL=Rustc,Cargo,Std', '/quiet', '/norestart')
-- 
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