Add support for gpu-rent.vars and enhance git update functionality

- Updated .gitignore to include gpu-rent.vars.
- Modified env.example to introduce the UPDATE_GIT variable for controlling git updates during execution.
- Implemented Import-GpuRentVars function in gpu-rent.ps1 to load environment variables from gpu-rent.vars.
- Enhanced gpu-rent.sh to support loading variables from gpu-rent.vars and added logic for handling default and extra arguments.
- Updated CLI documentation to reflect the new gpu-rent.vars file and its usage in configuration.
- Improved bootstrap and provisioning logic to conditionally perform git updates based on the new configuration.

gpu-rent.ps1

@@ -12,6 +12,33 @@ try {
 } catch {
 }
 
+function Import-GpuRentVars {
+    param([Parameter(Mandatory = $true)][string]$Path)
+    if (-not (Test-Path -LiteralPath $Path)) { return }
+    Get-Content -LiteralPath $Path -Encoding UTF8 | ForEach-Object {
+        $line = $_.Trim()
+        if (-not $line -or $line.StartsWith("#")) { return }
+        if ($line -match '^(?i)export\s+') {
+            $line = $line.Substring($Matches[0].Length).Trim()
+        }
+        $eq = $line.IndexOf("=")
+        if ($eq -lt 1) { return }
+        $key = $line.Substring(0, $eq).Trim()
+        $val = $line.Substring($eq + 1).Trim()
+        if ($val.Length -ge 2) {
+            $q = $val[0]
+            if (($q -eq '"' -or $q -eq "'") -and $val[-1] -eq $q) {
+                $val = $val.Substring(1, $val.Length - 2)
+            }
+        }
+        if (-not $key) { return }
+        $existing = [Environment]::GetEnvironmentVariable($key, "Process")
+        if ([string]::IsNullOrEmpty($existing)) {
+            Set-Item -Path "Env:$key" -Value $val
+        }
+    }
+}
+
 function Test-Python311 {
     param(
         [Parameter(Mandatory = $true)][string]$Exe,
@@ -91,7 +118,18 @@ function Copy-IfMissing {
 }
 Copy-IfMissing (Join-Path $Root "models.example.yaml") (Join-Path $Root "models.yaml") "models.yaml"
 Copy-IfMissing (Join-Path $Root "extensions.example.yaml") (Join-Path $Root "extensions.yaml") "extensions.yaml"
+Copy-IfMissing (Join-Path $Root "gpu-rent.vars.example") (Join-Path $Root "gpu-rent.vars") "gpu-rent.vars"
+
+Import-GpuRentVars (Join-Path $Root "gpu-rent.vars")
+
+$InvokeArgs = @($args)
+if ($InvokeArgs.Count -eq 0 -and $env:GPU_RENT_DEFAULT_ARGS) {
+    $InvokeArgs = @($env:GPU_RENT_DEFAULT_ARGS -split '\s+' | Where-Object { $_ })
+}
+if ($env:GPU_RENT_EXTRA_ARGS) {
+    $InvokeArgs += @($env:GPU_RENT_EXTRA_ARGS -split '\s+' | Where-Object { $_ })
+}
 
 $ErrorActionPreference = "Continue"
-& $VenvPy -m gpu_rent @args
+& $VenvPy -m gpu_rent @InvokeArgs
 exit $LASTEXITCODE