Add API to set update channel (#119)

It will only work with a PR to the core repo I have not yet created, but this can be merged before that

logic/system.ts

@@ -418,3 +418,7 @@ export async function requestReboot(): Promise<systemStatus> {
     throw new Error('Unable to request reboot');
   }
 }
+
+export async function setUpdateChannel(channel: string): Promise<void> {
+  return runCommand(`set-update-channel ${channel}`);
+}

routes/v2/system.ts

@@ -1,5 +1,5 @@
 import Router from '@koa/router';
-import {errorHandler} from '@runcitadel/utils';
+import {errorHandler, typeHelper} from '@runcitadel/utils';
 
 import * as systemLogic from '../../logic/system.js';
 import * as diskLogic from '../../logic/disk.js';
@@ -143,6 +143,12 @@ router.get('/disk-type', async (ctx, next) => {
   await next();
 });
 
+router.put('/update-channel', async (ctx, next) => {
+  typeHelper.isString(ctx.body.channel, ctx);
+  await systemLogic.setUpdateChannel(ctx.body.channel as string);
+  await next();
+});
+
 router.get('/', async (ctx, next) => {
   ctx.body = {os: constants.IS_CITADEL_OS ? 'Citadel OS' : 'unknown'};
   await next();