flora-6: init drone docker runner

hosts/flora-6/drone.nix

@@ -1,10 +1,10 @@
-{ config
-, lib
-, pkgs
-, self
-, ...
-}:
 {
+  config,
+  lib,
+  pkgs,
+  self,
+  ...
+}: {
   age.secrets.drone-secrets = {
     file = "${self}/secrets/drone-secrets.age";
     mode = "600";
@@ -31,12 +31,10 @@
     "d '/var/lib/drone-db' 0750 drone drone - -"
   ];
 
-  system.activationScripts.mkDroneNet =
-    let
+  system.activationScripts.mkDroneNet = let
     docker = config.virtualisation.oci-containers.backend;
     dockerBin = "${pkgs.${docker}}/bin/${docker}";
-    in
-    ''
+  in ''
     ${dockerBin} network inspect drone-net >/dev/null 2>&1 || ${dockerBin} network create drone-net --subnet 172.20.0.0/24
   '';
 
@@ -82,6 +80,28 @@
           config.age.secrets.drone-secrets.path
         ];
       };
+      containers."drone-docker-runner" = {
+        image = "drone/drone-runner-docker:1";
+        autoStart = true;
+        # needs to run as root
+        #user = "994";
+        volumes = [
+          "/var/run/docker.sock:/var/run/docker.sock"
+        ];
+        dependsOn = ["drone-db"];
+        extraOptions = [
+          "--network=drone-net"
+        ];
+        environment = {
+          DRONE_SERVER_HOST = "ci.pub.solar";
+          DRONE_SERVER_PROTO = "https";
+          DRONE_RUNNER_CAPACITY = "2";
+          DRONE_RUNNER_NAME = "flora-6-docker-runner";
+        };
+        environmentFiles = [
+          config.age.secrets.drone-secrets.path
+        ];
+      };
     };
   };
 }