ops: Add nix to dependabot.yml

[es-sai-fi]

I'm thinking of creating a workflow that triggers a nix build on dependabot branches to make sure package builds whenever a lock update happens, is this fine?

[greptile-apps]

Greptile Summary

This PR adds the nix package ecosystem to .github/dependabot.yml, enabling weekly automated dependency updates for the repository's Nix flake inputs. Dependabot will monitor flake.lock and open PRs when newer commits are available upstream for any flake inputs — this is a recently-added officially supported ecosystem (as of early April 2026) and the configuration here is correct.

Important Files Changed

Filename	Overview
.github/dependabot.yml	Adds the nix package ecosystem to Dependabot version updates, targeting the root directory on a weekly schedule. Configuration is correct and consistent with the existing cargo entry.

Sequence Diagram

sequenceDiagram
    participant D as Dependabot
    participant FL as flake.lock
    participant U as Upstream Nix Inputs
    participant PR as GitHub PR

    D->>FL: Read flake.lock weekly
    FL-->>D: Current pinned input revisions
    D->>U: Check for newer commits (GitHub/GitLab/Sourcehut/git)
    U-->>D: Latest available revisions
    alt Newer revision available
        D->>PR: Open PR to update flake.lock input
    else Already up to date
        D-->>D: No action needed
    end

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