first nixified version

.github/workflows/build.yaml

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+name: Build and push nixos-based docker container
+on: [push]
+
+env:
+  REGISTRY: git.strudelline.net
+  PACKAGE: cascade/docker-node-red
+  REGISTRY_AUTH_FILE: ./registry-auth.json
+
+jobs:
+  build:
+    runs-on: nix
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - run: pwd
+      - run: |
+          set -x
+          skopeo login --username ${{ secrets.DOCKER_USER }} --password ${{ secrets.DOCKER_PASSWORD }} "$REGISTRY"
+          stringprefix() { [ ${#1} -le $2 ] && echo $1 && return 0 || stringprefix "${1%?}" $2 ; }
+          SHORTSHA="$(stringprefix "$GITHUB_SHA" 8)"
+          for TAG in "$SHORTSHA" "$GITHUB_REF_NAME";do
+            nix run .#upload-image "docker://$REGISTRY/$PACKAGE:$TAG"
+          done

.gitignore

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+.*
+!.git?*
+
+*~
+\#*#
+result

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1722421184,
+        "narHash": "sha256-/DJBI6trCeVnasdjUo9pbnodCLZcFqnVZiLUfqLH4jA=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9f918d616c5321ad374ae6cb5ea89c9e04bf3e58",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "docker builder for cascade's node-red";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
+    let
+    lib = nixpkgs.lib;
+    pkgs = nixpkgs.legacyPackages.${system};
+    streamImage = pkgs.dockerTools.streamLayeredImage {
+      name = "node-red";
+      config.Cmd = [ "${pkgs.nodePackages.node-red}/bin/node-red" ];
+    };
+    in
+  {
+
+    packages.upload-image = pkgs.writeScriptBin "upload" ''
+      ${streamImage} | ${pkgs.skopeo}/bin/skopeo copy docker-archive:/dev/stdin "$@"
+    '';
+
+    packages.stream-image = streamImage;
+
+    packages.default = pkgs.writeScriptBin "help" ''
+      echo ${lib.escapeShellArg ''
+        nixos-based docker node-red image builder
+
+        usage:
+
+        nix run .#stream-image | docker load
+        nix run .#upload-image docker://registry.where/it/goes:its4tag
+        ''}
+
+    '';
+  });
+}