Add build script for cross-platform releases

.gitignore

@@ -1 +1,2 @@
-dist
+dist
+release

scripts/build.ps1

@@ -0,0 +1,28 @@
+
+$version = "v1.0.0"
+$platforms = @(
+    @{GOOS="windows"; GOARCH="amd64"; Suffix=".exe"},
+    @{GOOS="windows"; GOARCH="386"; Suffix=".exe"},
+    @{GOOS="linux"; GOARCH="amd64"; Suffix=""},
+    @{GOOS="linux"; GOARCH="386"; Suffix=""},
+    @{GOOS="darwin"; GOARCH="amd64"; Suffix=""},
+    @{GOOS="darwin"; GOARCH="arm64"; Suffix=""}
+)
+
+New-Item -ItemType Directory -Force -Path "release"
+
+foreach ($platform in $platforms) {
+    $env:GOOS = $platform.GOOS
+    $env:GOARCH = $platform.GOARCH
+
+    $output = "release/secgen_${version}_$($platform.GOOS)_$($platform.GOARCH)$($platform.Suffix)"
+    Write-Host "Building for $($platform.GOOS) $($platform.GOARCH)..."
+
+    go build -o $output main.go
+}
+
+Set-Location release
+Get-ChildItem -Filter "secgen_*" | ForEach-Object {
+    $hash = Get-FileHash -Algorithm SHA256 $_.Name
+    "$($hash.Hash)  $($_.Name)" | Out-File -Append -FilePath "checksums.txt"
+}