Download buffer issue when building an SD image from a flake using github actions

[SpidFightFR]

Describe the bug

Currently i'm trying to automatically build sd images of a nixos install for star64 , when i make a github action to compile the image, i end up having the following error:

warning: download buffer is full; consider increasing the 'download-buffer-size' setting

Right in the middle of building. I searched in the man page, on the internet...
Nothing related to nix and download buffer size.

The error seem to come from nix so i come here a bit lost ngl...

Steps To Reproduce

1. using github actions
2. nix build .#sd-image-cross
3. It ends up crashing
4. See error

Expected behavior

It should make a full system image as a .img file that can be written to an sd card.

Additional context

The error i encounter here is when using act that allows to emulate the same env as github acitons.
Here is my current action file

Priorities

Add 👍 to issues you find important.

[edolstra]

It's a warning, not an error. You can safely ignore it, or set download-buffer-size to a higher value than the default (64 MiB) if it annoys you.

[cole-h]

@SpidFightFR

It might be useful to qualify what "It ends up crashing" actually means, since that seems like the real issue, and the warning about "download buffer is full" is just a red herring.

[SpidFightFR]

@SpidFightFR

It might be useful to qualify what "It ends up crashing" actually means, since that seems like the real issue, and the warning about "download buffer is full" is just a red herring.

Hey, to be honest i don't know what's happening.

I tried to run nix build with -vvvvvv, the logs end with:

building of '/nix/store/2vivxdlhnd01700p3vrv05kkd6i8h44l-bash-riscv64-unknown-linux-gnu-5.2p32.drv^out' from .drv file: goal destroyed
lock released on '/nix/store/mpw2vsdhhm96a6g106gy732b4an4z0w1-stdenv-linux.lock'
building of '/nix/store/rf4q3gq52pcvx4m487m54clwfdrlxk1l-stdenv-linux.drv^out' from .drv file: goal destroyed
error: home directory '/homeless-shelter' exists; please remove it to assure purity of builds without sandboxing

I don't encounter this error on a native nixos install (outside of act), it just stops building out of nowhere.
I wished i could tell you more, i just don't have any answers.