chore(ci): switch most workflows to depot ci (#3352)

Continuing the trend of shifting away from GitHub services. Depot is
faster, and more reliable.

Avoiding docker + release workflows for now, as those have been a pain
in the ass to get correct.

Will check and see if we can ensure the logs/etc can be public.

I'm going to merge this, see how well it works, and if we're good delete
the matching github workflows

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## Checks
- [ ] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

1 files changed, 25 insertions, 0 deletions

diff --git a/.depot/workflows/update-nix-deps.yml b/.depot/workflows/update-nix-deps.yml
new file mode 100644
index 00000000..6c83816a
--- /dev/null
+++ b/.depot/workflows/update-nix-deps.yml
@@ -0,0 +1,25 @@
+# Depot CI Migration
+# Source: .github/workflows/update-nix-deps.yml
+#
+# No changes were necessary.
+
+name: Update Nix Deps
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '0 0 1 * *' # runs monthly on the first day of the month at 00:00
+jobs:
+  lockfile:
+    runs-on: depot-ubuntu-24.04
+    if: github.repository == 'atuinsh/atuin'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@main
+        with:
+          pr-title: "chore(deps): update flake.lock"
+          pr-labels: |
+            dependencies