feat(env): improve support for instances without internet connection (#3915)

packages/request-handler/src/update-checker.ts

@@ -3,6 +3,7 @@ import { Octokit } from "octokit";
 import { compareSemVer, isValidSemVer } from "semver-parser";
 
 import { fetchWithTimeout } from "@homarr/common";
+import { env } from "@homarr/common/env";
 import { logger } from "@homarr/log";
 import { createChannelWithLatestAndEvents } from "@homarr/redis";
 import { createCachedRequestHandler } from "@homarr/request-handler/lib/cached-request-handler";
@@ -13,6 +14,11 @@ export const updateCheckerRequestHandler = createCachedRequestHandler({
   queryKey: "homarr-update-checker",
   cacheDuration: dayjs.duration(1, "hour"),
   async requestAsync(_) {
+    if (env.NO_EXTERNAL_CONNECTION)
+      return {
+        availableUpdates: [],
+      };
+
     const octokit = new Octokit({
       request: {
         fetch: fetchWithTimeout,