chore: copy and adapt rivet release scripts for sandbox-agent

scripts/release/static/install.ps1

@@ -0,0 +1,51 @@
+#!/usr/bin/env pwsh
+
+$ErrorActionPreference = 'Stop'
+
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+# Create bin directory for sandbox-agent
+$BinDir = $env:BIN_DIR
+$SandboxAgentInstall = if ($BinDir) {
+	$BinDir
+} else {
+	"${Home}\.sandbox-agent\bin"
+}
+
+if (!(Test-Path $SandboxAgentInstall)) {
+	New-Item $SandboxAgentInstall -ItemType Directory | Out-Null
+}
+
+$SandboxAgentExe = "$SandboxAgentInstall\sandbox-agent.exe"
+$Version = '__VERSION__'
+$FileName = 'sandbox-agent-x86_64-pc-windows-gnu.exe'
+
+Write-Host
+Write-Host "> Installing sandbox-agent ${Version}"
+
+# Download binary
+$DownloadUrl = "https://releases.rivet.dev/sandbox-agent/${Version}/binaries/${FileName}"
+Write-Host
+Write-Host "> Downloading ${DownloadUrl}"
+Invoke-WebRequest $DownloadUrl -OutFile $SandboxAgentExe -UseBasicParsing
+
+# Install to PATH
+Write-Host
+Write-Host "> Installing sandbox-agent"
+$User = [System.EnvironmentVariableTarget]::User
+$Path = [System.Environment]::GetEnvironmentVariable('Path', $User)
+if (!(";${Path};".ToLower() -like "*;${SandboxAgentInstall};*".ToLower())) {
+	[System.Environment]::SetEnvironmentVariable('Path', "${Path};${SandboxAgentInstall}", $User)
+	$Env:Path += ";${SandboxAgentInstall}"
+    Write-Host "Please restart your PowerShell session or run the following command to refresh the environment variables:"
+    Write-Host "[System.Environment]::SetEnvironmentVariable('Path', '${Path};${SandboxAgentInstall}', [System.EnvironmentVariableTarget]::Process)"
+}
+
+Write-Host
+Write-Host "> Checking installation"
+sandbox-agent.exe --version
+
+Write-Host
+Write-Host "sandbox-agent was installed successfully to ${SandboxAgentExe}."
+Write-Host "Run 'sandbox-agent --help' to get started."
+Write-Host