nix install failing and breaking build

[ahonnecke]

ahonnecke@antonym:~/src$ git clone https://github.com/hcvst/cardano-daedalus-docker.git
Cloning into 'cardano-daedalus-docker'...
remote: Enumerating objects: 135, done.
remote: Total 135 (delta 0), reused 0 (delta 0), pack-reused 135
Receiving objects: 100% (135/135), 26.46 KiB | 342.00 KiB/s, done.
Resolving deltas: 100% (64/64), done.
ahonnecke@antonym:~/src$ cd cardano-daedalus-docker
ahonnecke@antonym:~/src/cardano-daedalus-docker$ docker-compose build

SNIP

Step 10/16 : RUN curl https://nixos.org/nix/install | sh
 ---> Running in a9e05a4f4dc2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2476  100  2476    0     0   2623      0 --:--:-- --:--:-- --:--:--  2622
downloading Nix 2.2.2 binary tarball for x86_64-linux from 'https://nixos.org/releases/nix/nix-2.2.2/nix-2.2.2-x86_64-linux.tar.bz2' to '/tmp/nix-binary-tarball-unpack.rjAzGyi08e'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 22.5M  100 22.5M    0     0  1823k      0  0:00:12  0:00:12 --:--:-- 2080k
performing a single-user installation of Nix...
copying Nix to /nix/store.................................
initialising Nix database...
Nix: creating /home/cardano/.nix-profile
installing 'nix-2.2.2'
error: cloning builder process: Operation not permitted
error: unable to start build process
/tmp/nix-binary-tarball-unpack.rjAzGyi08e/unpack/nix-2.2.2-x86_64-linux/install: unable to install Nix into your default profile
ERROR: Service 'cardano-sl' failed to build: The command '/bin/sh -c curl https://nixos.org/nix/install | sh' returned a non-zero code: 1