our nixpacks build is failing with this error

stage-0

RUN GIT_SSH_COMMAND='ssh -i /root/.ssh/id_rsa -o IdentitiesOnly=yes' yarn install --check-cache

711ms

Internal Error: Server answered with HTTP 500 when performing the request to https://repo.yarnpkg.com/4.12.0/packages/yarnpkg-cli/bin/yarn.js; for troubleshooting help, see https://github.com/nodejs/corepack#troubleshooting

at ClientRequest.<anonymous> (/nix/store/fkyp1bm5gll9adnfcj92snyym524mdrj-nodejs-22.11.0/lib/node_modules/corepack/dist/lib/corepack.cjs:42205:23)

at Object.onceWrapper (node:events:633:26)

at ClientRequest.emit (node:events:518:28)

at HTTPParser.parserOnIncomingClient (node:_http_client:704:27)

at HTTPParser.parserOnHeadersComplete (node:_http_common:117:17)

at TLSSocket.socketOnData (node:_http_client:546:22)

at TLSSocket.emit (node:events:518:28)

at addChunk (node:internal/streams/readable:561:12)

at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)

at Readable.push (node:internal/streams/readable:392:5)

Dockerfile:25

-------------------

23 | RUN --mount=type=cache,id=s/0ade5086-3efb-4495-95f3-6080b95b372e-/usr/local/share/cache/yarn/v6,target=/usr/local/share/.cache/yarn/v6 GIT_SSH_COMMAND='ssh -i /root/.ssh/id_rsa -o IdentitiesOnly=yes' ssh -T git@github.com || true

24 | RUN --mount=type=cache,id=s/0ade5086-3efb-4495-95f3-6080b95b372e-/usr/local/share/cache/yarn/v6,target=/usr/local/share/.cache/yarn/v6 npm install -g corepack@0.24.1 && corepack enable

25 | >>> RUN --mount=type=cache,id=s/0ade5086-3efb-4495-95f3-6080b95b372e-/usr/local/share/cache/yarn/v6,target=/usr/local/share/.cache/yarn/v6 GIT_SSH_COMMAND='ssh -i /root/.ssh/id_rsa -o IdentitiesOnly=yes' yarn install --check-cache

26 |

27 | # build phase

-------------------

confirmed that yarn is reachable. builds on CI are succeeding.