Support changing download source in postinstall

[typed-sigterm]

Is your feature request related to a problem? Please describe.
You know what GFW had being doing😶

cli/scripts/postinstall.js

Line 44 in d8fe26d

const url = `https://github.com/${repo}/releases/download/v${version}/${pkgName}_${platform}_${arch}.tar.gz`;

cli/scripts/postinstall.js

Line 52 in d8fe26d

const checksumFileUrl = `https://github.com/${repo}/releases/download/v${version}/${pkgName}_${version}_checksums.txt`;

Describe the solution you'd like
Read template string from an environment variable to replace the hard-coded url.

[sweatybridge]

Do you have the error logs by any chance? I believe we are already handling https_proxy variables using https-proxy-agent package.

[typed-sigterm]

Do you have the error logs by any chance? I believe we are already handling https_proxy variables using https-proxy-agent package.

That's fixed after rebooting :)

[typed-sigterm]

This is a very serious issue for devs in China. I think we can publish binaries to npm, just like what bun is doing. Then npmmirror will accept this.

update: Now I can confirm that it's by passing the proxy. (using bun v1.2.2) My teammate can reproduce it too.

Logs

  📦 Installing [1195/1194] [Scripts] Starting scripts for "@parcel/watcher"
[Scripts] Starting scripts for "esbuild"
[Scripts] Starting scripts for "supabase"
  ⚙️  supabase [2/3] [Scripts] Finished scripts for "@parcel/watcher"
  ⚙️  supabase [3/3] Downloading https://github.com/supabase/cli/releases/download/v2.9.6/supabase_2.9.6_checksums.txt        
[Scripts] Finished scripts for "esbuild"
warn: supabase's postinstall has costed you 5.5s
warn: supabase's postinstall has costed you 10.5s
warn: supabase's postinstall has costed you 15.6s
warn: supabase's postinstall has costed you 20.6s
file:///D:/hzh/paper-chemis-website/node_modules/node-fetch/src/index.js:108
                        reject(new FetchError(`request to ${request.url} failed, reason: ${error.message}`, 'system', error));
                               ^

FetchError: request to https://github.com/supabase/cli/releases/download/v2.9.6/supabase_2.9.6_checksums.txt failed, reason: connect ETIMEDOUT 20.205.243.166:443
    at ClientRequest.<anonymous> (file:///.../node_modules/node-fetch/src/index.js:108:11)
    at ClientRequest.emit (node:events:524:28)
    at emitErrorEvent (node:_http_client:104:11)
    at TLSSocket.socketErrorListener (node:_http_client:518:5)
    at TLSSocket.emit (node:events:524:28)
    at emitErrorNT (node:internal/streams/destroy:170:8)
    at emitErrorCloseNT (node:internal/streams/destroy:129:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
  type: 'system',
  errno: 'ETIMEDOUT',
  code: 'ETIMEDOUT',
  erroredSysCall: 'connect'
}

Node.js v22.13.1
error: postinstall script from "supabase" exited with 1