feat: run "build and push" on push to main

.github/workflows/build.yml

@@ -2,6 +2,9 @@ name: Build and Push docker image
 on:
   workflow_dispatch:
   workflow_call:
+  push:
+    branches:
+      - main
 
 jobs:
   buildAndPush:

flake.nix

@@ -7,7 +7,8 @@
   outputs = { nixpkgs, nix, self }:
     let pkgs = import nixpkgs { system = "x86_64-linux"; }; in {
       packages.x86_64-linux = rec {
-        default = nix;
+        default = nix-with-tools;
+
         minimal-nix = import (nix + "/docker.nix") {
           inherit pkgs;
           extraPkgs = [ pkgs.nodejs ];
@@ -20,7 +21,7 @@
             "org.opencontainers.image.description" = "Nix container image with nodejs";
           };
         };
-        nix = import (nix + "/docker.nix") {
+        nix-with-tools = import (nix + "/docker.nix") {
           inherit pkgs;
           extraPkgs = [ pkgs.nodejs pkgs.skopeo ];