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, 33 insertions, 0 deletions

diff --git a/.depot/workflows/nix.yml b/.depot/workflows/nix.yml
new file mode 100644
index 00000000..3b5a360a
--- /dev/null
+++ b/.depot/workflows/nix.yml
@@ -0,0 +1,33 @@
+# Depot CI Migration
+# Source: .github/workflows/nix.yml
+#
+# No changes were necessary.
+
+# Verify the Nix build is working
+# Failures will usually occur due to an out of date Rust version
+# That can be updated to the latest version in nixpkgs-unstable with `nix flake update`
+name: Nix
+on:
+  push:
+    branches: [main]
+    paths-ignore:
+      - 'ui/**'
+  pull_request:
+    branches: [main]
+    paths-ignore:
+      - 'ui/**'
+jobs:
+  check:
+    runs-on: depot-ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v6
+      - uses: cachix/install-nix-action@v31
+      - name: Run nix flake check
+        run: nix flake check --print-build-logs
+  build-test:
+    runs-on: depot-ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v6
+      - uses: cachix/install-nix-action@v31
+      - name: Run nix build
+        run: nix build --print-build-logs