ci: Add Build workflow

`lxmonika` and the `monika.exe` CLI will be built and packed for all
supported architectures for each commit.

Monix is not included.

This workflow only includes a basic build. No testing is carried out
yet.

.github/workflows/build.yml

@@ -0,0 +1,53 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - "master"
+      - "staging"
+      - "dev/**"
+  pull_request:
+    branches:
+      - "master"
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        platform: [x86, x64, ARM, ARM64]
+        configuration: [Debug, Release]
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Fetch everything for build metadata to work
+          fetch-depth: 0
+
+      - name: Install build dependencies
+        run: powershell.exe -File ${{ github.workspace }}\setup.ps1
+        shell: cmd
+
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@v2
+
+      - name: Build
+        run: |
+            msbuild ${{ github.workspace }}\lxmonika.sln ^
+                /p:Platform=${{ matrix.platform }} ^
+                /p:Configuration=${{ matrix.configuration }}
+        shell: cmd
+
+      - name: Pack build artifacts
+        run: |
+            powershell.exe -File ${{ github.workspace }}\pack.ps1 ^
+                -Platform ${{ matrix.platform }} ^
+                -Configuration ${{ matrix.configuration }}
+        shell: cmd
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: monika_${{ matrix.platform }}_${{ matrix.configuration }}
+          path: out

pack.ps1

@@ -0,0 +1,63 @@
+param(
+    [Parameter(Mandatory=$true)]
+    [string]$Platform,
+    [Parameter(Mandatory=$true)]
+    [string]$Configuration
+)
+
+$outDir = (Join-Path $PSScriptRoot "out")
+
+Remove-Item -Recurse -Path $outDir
+mkdir $outDir | Out-Null
+
+function Get-LxMonikaArtifact(
+    [string]$Project,
+    [string]$File
+)
+{
+    return Join-Path "$PSScriptRoot\$Project\bin\$Configuration\$Platform" $File
+}
+
+# monika.exe
+
+Copy-Item `
+    -Path (Get-LxMonikaArtifact "monika" "monika.exe") `
+    -Destination $outDir
+
+# lxmonika
+
+$usefulExts = @(".sys", ".lib", ".cer")
+
+foreach ($ext in $usefulExts)
+{
+    Copy-Item `
+        -Path (Get-LxMonikaArtifact "lxmonika" "lxmonika$ext") `
+        -Destination $outDir
+}
+
+# lxstub
+
+foreach ($ext in $usefulExts)
+{
+    Copy-Item `
+        -Path (Get-LxMonikaArtifact "lxstub" "LXCORE$ext") `
+        -Destination $outDir
+}
+
+# PDBs
+
+$pdbDir = (Join-Path $outDir "pdb")
+mkdir $pdbDir | Out-Null
+
+Copy-Item `
+    -Path (Get-LxMonikaArtifact "monika" "monika.pdb") `
+    -Destination $pdbDir
+
+Copy-Item `
+    -Path (Get-LxMonikaArtifact "lxmonika" "lxmonika.pdb") `
+    -Destination $pdbDir
+
+Copy-Item `
+    -Path (Get-LxMonikaArtifact "lxstub" "LXCORE.pdb") `
+    -Destination $pdbDir
+

setup.ps1

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+# Setup WDK and corresponding SDK
+
+curl.exe `
+    -SL https://download.microsoft.com/download/C/D/8/CD8533F8-5324-4D30-824C-B834C5AD51F9/standalonesdk/sdksetup.exe `
+    -o sdksetup_14393.exe
+Start-Process .\sdksetup_14393.exe -Wait -ArgumentList '/ceip off /features + /q'
+Remove-Item sdksetup_14393.exe
+
+curl.exe `
+    -SL https://download.microsoft.com/download/8/1/6/816FE939-15C7-4185-9767-42ED05524A95/wdk/wdksetup.exe `
+    -o wdksetup_14393.exe
+Start-Process .\wdksetup_14393.exe -Wait -ArgumentList '/ceip off /features + /q'
+Remove-Item wdksetup_14393.exe
+
+curl.exe `
+    -SL https://download.microsoft.com/download/5/A/0/5A08CEF4-3EC9-494A-9578-AB687E716C12/windowssdk/winsdksetup.exe `
+    -o sdksetup_17134.exe
+Start-Process .\sdksetup_17134.exe -Wait -ArgumentList '/ceip off /features + /q'
+Remove-Item sdksetup_17134.exe
+
+curl.exe `
+    -SL https://download.microsoft.com/download/B/5/8/B58D625D-17D6-47A8-B3D3-668670B6D1EB/wdk/wdksetup.exe `
+    -o wdksetup_17134.exe
+Start-Process .\wdksetup_17134.exe -Wait -ArgumentList '/ceip off /features + /q'
+Remove-Item wdksetup_17134.exe
+
+# Hacks to enable ARM32 builds
+
+$vsPath = (vswhere -property installationPath | Out-String).Trim();
+
+$arm64Path = (Join-Path $vsPath "\MSBuild\Microsoft\VC\v170\Platforms\ARM64");
+$armPath = (Join-Path $vsPath "\MSBuild\Microsoft\VC\v170\Platforms\ARM")
+
+if (Test-Path $arm64Path)
+{
+    Push-Location $arm64Path
+    foreach ($file in (Get-ChildItem -Recurse $arm64Path -File))
+    {
+        $relativePath = Resolve-Path -Path $file.FullName -Relative
+        $armFilePath = Join-Path $armPath $relativePath
+        if (Test-Path (Join-Path $armPath $relativePath))
+        {
+            continue;
+        }
+        Copy-Item -Path $file.FullName -Destination $armFilePath -Force -Verbose
+    }
+    Pop-Location
+}