ci: build docker container and do caching

Author: trickypr

.github/workflows/nix.yml

@@ -0,0 +1,19 @@
+name: "nix builder"
+on:
+  push:
+    branches:
+    - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v25
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+    - uses: cachix/cachix-action@v14
+      with:
+        name: trickypr
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: nix build
+

.gitignore

@@ -1,2 +1,3 @@
 /target
 .direnv/
+result

flake.lock

@@ -8,6 +8,9 @@
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    crane = {
+      url = "github:ipetkov/crane";
+    };
   };
 
   outputs =
@@ -16,24 +19,39 @@
       nixpkgs,
       rust-overlay,
       flake-utils,
+      crane,
       ...
     }:
     flake-utils.lib.eachDefaultSystem (
       system:
       let
         overlays = [ (import rust-overlay) ];
+        package = import ./nix/package.nix;
+        docker-image = import ./nix/docker-image.nix;
         pkgs = import nixpkgs {
           inherit system overlays;
         };
+        craneLib = crane.mkLib pkgs;
       in
       {
+        packages = rec {
+          bin = package {
+            inherit pkgs;
+            craneLib = craneLib;
+          };
+          docker = docker-image {
+            inherit pkgs;
+            bin = bin;
+          };
+          default = docker;
+        };
+
         devShells.default =
           with pkgs;
           mkShell {
             buildInputs = [
-              openssl
-              pkg-config
               rust-bin.stable.latest.default
+              dive
             ];
 
             shellHook = '''';

flake.nix

@@ -0,0 +1,9 @@
+{ pkgs, bin, ... }:
+pkgs.dockerTools.buildImage {
+  name = "ghcr.io/anucssa/rubric-merge";
+  tag = "latest";
+  copyToRoot = [ bin ];
+  config = {
+    Cmd = [ "${bin}/bin/rubric-merge" ];
+  };
+}

nix/docker-image.nix

@@ -0,0 +1,6 @@
+{ craneLib, ... }:
+craneLib.buildPackage rec {
+  pname = "rubric-merge";
+  name = pname;
+  src = craneLib.cleanCargoSource ../.;
+}