nixos/renovate: Fix ShellCheck issue

[l0b0]

Tracking issue #349572.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[l0b0]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 373131

---

x86_64-linux

⏩ 2 packages blacklisted:

• nixos-install-tools
• tests.nixos-functions.nixos-test

✅ 5 packages built:

• tests.devShellTools.nixos
• tests.testers.lycheeLinkCheck.network
• tests.testers.nixosTest-example
• tests.testers.runNixOSTest-example
• tests.trivial-builders.references

[l0b0]

My runs of nix-build -A nixosTests.renovate got stuck in a loop, with the last two lines repeating seemingly indefinitely:

machine # [   11.548947] gitea[878]: 2025/01/12 09:38:01 ...s/graceful/server.go:50:NewServer() [I] Starting new Web server: tcp:0.0.0.0:3000 on PID: 878
machine: Guest root shell did not produce any data yet...
machine:   To debug, enter the VM and run 'systemctl status backdoor.service'.
machine: Guest root shell did not produce any data yet...
machine:   To debug, enter the VM and run 'systemctl status backdoor.service'.

So:

@ofborg test renovate

[l0b0]

My runs of nix-build -A nixosTests.renovate got stuck in a loop, with the last two lines repeating seemingly indefinitely:
[…]

Turns out systemd.enableStrictShellChecks = true itself was causing the boot to hang!

[l0b0]

@ofborg test renovate