Add CI

.forgejo/workflows/ci.yml

@@ -0,0 +1,19 @@
+name: CI
+on:
+  push:
+    branches:
+      - main
+jobs:
+  lint:
+    runs-on: docker
+    container:
+      image: ghcr.io/catthehacker/ubuntu:runner-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Nix
+        uses: https://guardianproject.dev/actions/install-nix-action@v31
+
+      - name: Run CI
+        run: nix develop --command make ci