add ci/cd

Author: gvolpe

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: Nix
+
+on:
+  pull_request: {}
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Checks
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: "Install Nix ❄️"
+        uses: cachix/install-nix-action@v31.2.0
+
+      - name: "Install Cachix ❄️"
+        uses: cachix/cachix-action@v16
+        with:
+          name: profunktor
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: "Nix flake check ❄️"
+        run: |
+          nix flake check --all-systems -L
+          nix buil .#sbt -L

README.md

@@ -1,4 +1,5 @@
 dev-tools
 =========
+[![CI Status](https://github.com/profunktor/dev-tools/workflows/Nix/badge.svg)](https://github.com/profunktor/dev-tools/actions)
 
 [Scala](https://www.scala-lang.org/) development tools powered by [Nix](https://nixos.org/).

flake.nix

@@ -28,7 +28,7 @@
         };
       in
       {
-        devShell = pkgs.mkShell {
+        devShells.default = pkgs.mkShell {
           name = "profunktor-scala-dev-shell";
 
           buildInputs = with pkgs; [