Add scripts for building and managing RustDesk versions

- Implement Build-CustomRustDesk.ps1 to build RustDesk with specified version and configuration.
- Create Get-LastBuiltVersion.ps1 to retrieve the last built version from a state file.
- Add Get-LatestRustDeskVersion.ps1 to fetch the latest version from GitHub releases.
- Develop Invoke-RustDeskPipeline.ps1 to orchestrate the build and deployment process.
- Introduce Publish-Artifacts.ps1 for publishing build artifacts via SMB or SCP.
- Implement Set-LastBuiltVersion.ps1 to update the state file with the last built version.

scripts/Get-LatestRustDeskVersion.ps1

@@ -0,0 +1,16 @@
+function Get-LatestRustDeskVersion {
+  [CmdletBinding()]
+  param()
+
+  $url = "https://api.github.com/repos/rustdesk/rustdesk/releases/latest"
+
+  # GitHub API can reject requests without a User-Agent.
+  $headers = @{ "User-Agent" = "rustdesk-gitea-automation" }
+  $response = Invoke-RestMethod -Method Get -Uri $url -Headers $headers
+
+  if (-not $response.tag_name) {
+    throw "Unable to read latest RustDesk tag_name from GitHub API response."
+  }
+
+  return [string]$response.tag_name
+}