Attempt at using nixos CI builder

.gitea/workflows/check-flake.yaml

@@ -4,19 +4,14 @@ on: [push]
 
 env:
   DEBIAN_FRONTEND: noninteractive
-  SSH_AUTH_SOCK: /tmp/ssh_agent.sock
 
 jobs:
   check-flake:
-    runs-on: ubuntu-latest
+    runs-on: nixos
     steps:
-      - name: Install Nix
-        uses: https://github.com/cachix/install-nix-action@v23
-        with:
-          github_access_token: ${{ secrets.__GITHUB_TOKEN }}
-          extra_nix_config: |
-            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= s0.koi-bebop.ts.net:OjbzD86YjyJZpCp9RWaQKANaflcpKhtzBMNP8I2aPUU=
-            substituters = https://cache.nixos.org/ http://s0.koi-bebop.ts.net:5000
+
+      - name: Install dependencies
+        run: nix profile install nixpkgs#nodejs-18_x
 
       - name: Checkout the repository
         uses: actions/checkout@v3
@@ -24,25 +19,4 @@ jobs:
           fetch-depth: 0
 
       - name: Check Flake
-        run: |
-          # Can only build x84_64 for now, so pick out those specifically
-          # nix flake check --show-trace
-
-          nix build .#nixosConfigurations."ray".config.system.build.toplevel
-          nix build .#nixosConfigurations."s0".config.system.build.toplevel
-          nix build .#nixosConfigurations."ponyo".config.system.build.toplevel
-          nix build .#nixosConfigurations."zoidberg".config.system.build.toplevel
-
-      - name: Setup SSH For Pushing to Binary Cache
-        run: |
-          # Set up push key with ssh-agent
-          echo "${{ secrets.BINARY_CACHE_PUSH_SSH_KEY }}" | base64 -d > ./.id_ed25519
-          chmod 600 ./.id_ed25519
-          eval $(ssh-agent -a $SSH_AUTH_SOCK)
-          ssh-add ./.id_ed25519
-          # Add Binary Cache as known host
-          mkdir -p ~/.ssh
-          echo "s0.koi-bebop.ts.net ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAwiXcUFtAvZCayhu4+AIcF+Ktrdgv9ee/mXSIhJbp4q" | tee -a ~/.ssh/known_hosts
-
-      - name: Copy all built derivations to remote cache
-        run: nix copy --to ssh://cache-push@s0.koi-bebop.ts.net /nix/store/*
+        run: nix flake check --show-trace

common/server/default.nix

@@ -18,5 +18,6 @@
     ./nextcloud.nix
     ./iodine.nix
     ./searx.nix
+    ./gitea-actions-runner.nix
   ];
 }

common/server/gitea-actions-runner.nix

@@ -0,0 +1,69 @@
+{ config, pkgs, lib, ... }:
+
+# Gitea Actions Runner. Starts 'host' runner that runs directly on the host inside of a nixos container
+# This is useful for providing a real Nix/OS builder to gitea.
+# Warning, NixOS containers are not secure. For example, the container shares the /nix/store
+# Therefore, this should not be used to run untrusted code.
+# To enable, assign a machine the 'gitea-actions-runner' system role
+
+let
+  runnerRole = "gitea-actions-runner";
+  runners = config.machines.roles.${runnerRole};
+  thisMachineIsARunner = builtins.elem config.networking.hostName runners;
+in
+{
+  config = lib.mkIf thisMachineIsARunner {
+    containers.gitea-runner = {
+      ephemeral = true;
+      autoStart = true;
+
+      bindMounts =
+        {
+          "/run/agenix/gitea-actions-runner-token" = {
+            hostPath = "/run/agenix/gitea-actions-runner-token";
+            isReadOnly = true;
+          };
+          "/var/lib/private/gitea-runner" = {
+            hostPath = "/var/lib/private/gitea-runner";
+            isReadOnly = false;
+          };
+        };
+
+      extraFlags = [
+        # Allow podman
+        "--system-call-filter=@keyring"
+      ];
+
+      config = {
+        # TODO: figure out why importing 'allModules' fails
+        # imports = allModules;
+
+        # speeds up evaluation
+        nixpkgs.pkgs = pkgs;
+
+        environment.systemPackages = with pkgs; [
+          nodejs
+          git
+        ];
+
+        services.gitea-actions-runner.instances.inst = {
+          enable = true;
+          name = config.networking.hostName;
+          url = "https://git.neet.dev/";
+          tokenFile = "/run/agenix/gitea-actions-runner-token";
+          labels = [
+            "ubuntu-latest:docker://node:18-bullseye"
+            "nixos:host"
+          ];
+        };
+
+        virtualisation.podman.enable = true;
+        boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
+
+        system.stateVersion = "23.05";
+      };
+    };
+
+    age.secrets.gitea-actions-runner-token.file = ../../secrets/gitea-actions-runner-token.age;
+  };
+}

machines/storage/s0/default.nix

@@ -9,20 +9,6 @@
 
   # system.autoUpgrade.enable = true;
 
-  # gitea runner and allow it to build ARM derivationsFV
-  services.gitea-actions-runner.instances.inst = {
-    enable = true;
-    name = config.networking.hostName;
-    url = "https://git.neet.dev/";
-    tokenFile = "/run/agenix/gitea-actions-runner-token";
-    labels = [
-      "debian-latest:docker://catthehacker/ubuntu:act-latest"
-      "ubuntu-latest:docker://catthehacker/ubuntu:act-latest"
-    ];
-  };
-  virtualisation.podman.enable = true;
-  age.secrets.gitea-actions-runner-token.file = ../../../secrets/gitea-actions-runner-token.age;
-  boot.binfmt.emulatedSystems = [ "aarch64-linux" ]; # todo: still needed?
   nix.gc.automatic = lib.mkForce false; # allow the nix store to serve as a build cache
 
   # binary cache