Implement reversible Sentinel beta foundation

scripts/bootstrap-ocsentinel-ninja.ps1

@@ -1,6 +1,8 @@
 [CmdletBinding()]
 param(
-    [string]$ManifestUrl = "https://gitea.officecom.cloud/officecom/oc-sentinel/raw/main/release/stable/version.json",
+    [string]$ManifestUrl = "",
+    [ValidateSet("stable", "beta")]
+    [string]$ReleaseChannel = "stable",
     [string]$WebhookUrl = "",
     [string]$SecretValue = "",
     [switch]$RunInitialStatusScan
@@ -112,6 +114,20 @@ function Get-OCSentinelArtifact {
 
 Initialize-OCSentinelTls
 
+if ($ReleaseChannel -eq "stable" -and -not [string]::IsNullOrWhiteSpace($env:ReleaseChannel)) {
+    $requestedChannel = $env:ReleaseChannel.Trim().ToLowerInvariant()
+    if ($requestedChannel -notin @("stable", "beta")) {
+        throw "ReleaseChannel must be stable or beta."
+    }
+    $ReleaseChannel = $requestedChannel
+}
+
+if ([string]::IsNullOrWhiteSpace($ManifestUrl)) {
+    $ManifestUrl = "https://gitea.officecom.cloud/officecom/oc-sentinel/raw/main/release/$ReleaseChannel/version.json"
+}
+
+Write-Host "OCSentinel release channel: $ReleaseChannel"
+
 $installRoot = Join-Path $env:ProgramFiles "OCSentinel"
 $updaterPath = Join-Path $installRoot "scripts\update-ocsentinel.ps1"
 $monitorPath = Join-Path $installRoot "scripts\run-ocsentinel-monitor.ps1"