Add Github Actions based on nix

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: ci
+
+on: push
+
+concurrency:
+  group: ${{ github.ref }}_ci
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: DeterminateSystems/flake-checker-action@main
+      - name: Build binaries
+        run: nix develop --command sbt nativeLink
+

flake.nix

@@ -14,6 +14,8 @@
       inputs.systems.follows = "systems";
     };
 
+    nixpkgs.url = "github:NixOS/nixpkgs-unstable";
+
     sn-bindgen = {
       url = "github:igor-ramazanov/sn-bindgen/update-flake";
       inputs = {