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Merge pull request #48 from tsirysndr/fix/pkgs/nix-installer

[pkgs] fix nix installer

fix(nix): add '--init none' only if systemd is not installed

fix ci

fix ci

update README

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fix: set current USER env var

fix nix installer issue

Merge pull request #44 from tsirysndr/fix/nix-installer-init

fix: add '--init none' argument to nix installer

Merge pull request #40 from tsirysndr/feat/rustup-extension

feat: add builtin extension for `rustup`

Merge pull request #37 from tsirysndr/feat/backup-option

feat: add --backup option

Merge pull request #35 from tsirysndr/feat/load-secrets-from-env

feat: load secrets from env

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