reconciliate old/new runners

machines/dev/forgejo-ci/forgejo-actions-runner.nix

@@ -1,4 +1,3 @@
-# source: https://git.clan.lol/clan/clan-infra/src/branch/main/modules/web01/gitea/actions-runner.nix
 {
   pkgs,
   lib,
@@ -39,7 +38,55 @@ let
   '';
   numInstances = 2;
 in
+
 {
+  _class = "nixos";
+
+  services.gitea-actions-runner = {
+    package = pkgs.forgejo-actions-runner;
+    instances = lib.genAttrs (builtins.genList (n: "nix${builtins.toString n}") numInstances) (_: {
+      enable = true;
+      name = config.networking.fqdn;
+      url = "https://git.fediversity.eu";
+      tokenFile = config.age.secrets.forgejo-runner-token.path;
+      ## This runner supports Docker (with a default Ubuntu image) and native
+      ## modes. In native mode, it contains a few default packages.
+      labels = [
+        "nix:docker://gitea-runner-nix"
+        "docker:docker://node:16-bullseye"
+        "native:host"
+      ];
+      hostPackages = with pkgs; [
+        bash
+        git
+        nix
+        nodejs
+      ];
+      settings = {
+        container = {
+          options = "-e NIX_BUILD_SHELL=/bin/bash -e PAGER=cat -e PATH=/bin -e SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt --device /dev/kvm -v /nix:/nix -v ${storeDeps}/bin:/bin -v ${storeDeps}/etc/ssl:/etc/ssl --user nixuser --device=/dev/kvm";
+          # the default network that also respects our dns server settings
+          network = "host";
+          valid_volumes = [
+            "/nix"
+            "${storeDeps}/bin"
+            "${storeDeps}/etc/ssl"
+          ];
+        };
+        log.level = "info";
+        runner = {
+          file = ".runner";
+          # Take only 1 job at a time to avoid clashing NixOS tests, see #362
+          capacity = 1;
+          timeout = "3h";
+          insecure = false;
+          fetch_timeout = "5s";
+          fetch_interval = "2s";
+        };
+      };
+    });
+  };
+
   users = {
     users.nixuser = {
       group = "nixuser";
@@ -50,42 +97,24 @@ in
     groups.nixuser = { };
   };
   virtualisation = {
-    podman.enable = true;
+    ## For the Docker mode of the runner.
+    docker.enable = true;
     containers.containersConf.settings = {
-      # podman seems to not work with systemd-resolved
+      # podman (at least) seems to not work with systemd-resolved
       containers.dns_servers = [
         "8.8.8.8"
         "8.8.4.4"
       ];
     };
   };
-  services.gitea-actions-runner.instances =
-    lib.genAttrs (builtins.genList (n: "nix${builtins.toString n}") numInstances)
-      (_: {
-        enable = true;
-        name = "nix-runner";
-        url = "https://git.fediversity.eu";
-        tokenFile = config.age.secrets.forgejo-runner-token.path;
-        labels = [ "nix:docker://gitea-runner-nix" ];
-        settings = {
-          container.options = "-e NIX_BUILD_SHELL=/bin/bash -e PAGER=cat -e PATH=/bin -e SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt --device /dev/kvm -v /nix:/nix -v ${storeDeps}/bin:/bin -v ${storeDeps}/etc/ssl:/etc/ssl --user nixuser --device=/dev/kvm";
-          # the default network that also respects our dns server settings
-          container.network = "host";
-          container.valid_volumes = [
-            "/nix"
-            "${storeDeps}/bin"
-            "${storeDeps}/etc/ssl"
-          ];
-        };
-      });
   systemd.services =
     {
       gitea-runner-nix-image = {
         wantedBy = [ "multi-user.target" ];
-        after = [ "podman.service" ];
+        after = [ "docker.service" ];
-        requires = [ "podman.service" ];
+        requires = [ "docker.service" ];
         path = [
-          config.virtualisation.podman.package
+          pkgs.docker
           pkgs.gnutar
           pkgs.shadow
           pkgs.getent
@@ -124,7 +153,7 @@ in
 
           # list the content as it will be imported into the container
           tar -cv . | tar -tvf -
-          tar -cv . | podman import - gitea-runner-nix
+          tar -cv . | docker import - gitea-runner-nix
         '';
         serviceConfig = {
           RuntimeDirectory = "gitea-runner-nix-image";
@@ -185,7 +214,7 @@ in
             "~setdomainname"
             "~sethostname"
           ];
-          SupplementaryGroups = [ "podman" ];
+          SupplementaryGroups = [ "docker" ];
           RestrictAddressFamilies = [
             "AF_INET"
             "AF_INET6"