feat: add support for VSCODE_PROXY_URI

Author: jsjoeio

patches/proxy-uri.diff

@@ -68,7 +68,7 @@ Index: code-server/lib/vscode/src/vs/server/node/webClientServer.ts
  				rootEndpoint: base,
  				updateEndpoint: !this._environmentService.args['disable-update-check'] ? base + '/update/check' : undefined,
  				logoutEndpoint: this._environmentService.args['auth'] && this._environmentService.args['auth'] !== "none" ? base + '/logout' : undefined,
-+				proxyEndpointTemplate: base + '/proxy/{{port}}',
++				proxyEndpointTemplate: process.env.VSCODE_PROXY_URI ?? base + '/proxy/{{port}}',
  				embedderIdentifier: 'server-distro',
  				extensionsGallery: this._productService.extensionsGallery,
  			},