Only use nix-daemon when systemd is supported

[SuperSandro2000]

Tested like with nix-update by applying the following patch

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 852dc7b..9d9dc13 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v13
+    - uses: supersandro2000/install-nix-action@patch-1
       with:
         install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210604_8e6ee1b/install
     - name: build

and running

sudo rm ~/.cache/act/ -rf && nix-shell -p act --command "sudo -E \$(which act)"