add a nix-flake runner

.github/workflows/nix.yml

@@ -18,12 +18,11 @@ jobs:
           - nixos-unstable
           - nixos-22.11
           - nixos-23.05
-    runs-on: native
+    runs-on: ubuntu-latest
-    container: pjjw/nix-flake-runner:1
     steps:
       - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
       - run: nix-shell --run ./ci.sh
         env:
-          CI_PROJECT_PATH: pjjw
           CI_REGISTRY_AUTH: '${{ secrets.REGISTRY_AUTH }}'
           NIXPKGS_CHANNEL: '${{ matrix.channel }}'

images/nix-flakes-runner/default.nix

@@ -0,0 +1,10 @@
+{ docker-nixpkgs
+, nodejs
+, extraContents ? [ ]
+}:
+docker-nixpkgs.nix-flakes.override {
+  extraContents = [
+    # nodejs for runner
+    nodejs
+  ] ++ extraContents;
+}