fix drone to podman and add dovecot secret

hosts/fw.cloonar.com/modules/drone/server.nix

@@ -1,7 +1,13 @@
 { config, pkgs, ... }:
 
 {
-  virtualisation.docker.enable = true;
+  virtualisation = {
+    podman = {
+      enable = true;
+      dockerCompat = true;
+      defaultNetwork.settings.dns_enabled = true;
+    };
+  };
 
   users.users.drone-server = {
     isSystemUser = true;
@@ -16,7 +22,7 @@
     description = "Drone Server (CI CD Service)";
     after = [ "network.target" ];
     wantedBy = [ "multi-user.target" ];
-    path = [ pkgs.docker ];
+    path = [ pkgs.podman ];
 
     serviceConfig = {
       # Type = "simple";
@@ -25,12 +31,12 @@
       Group = "drone-server";
       Restart = "always";
       ExecStartPre= ''
-        -${pkgs.docker}/bin/docker stop %n \
-        -${pkgs.docker}/bin/docker rm %n \
-        ${pkgs.docker}/bin/docker pull drone/drone:2.20.0
+        -${pkgs.podman}/bin/podman stop %n \
+        -${pkgs.podman}/bin/podman rm %n \
+        ${pkgs.podman}/bin/podman pull drone/drone:2.20.0
       '';
       ExecStart= ''
-        ${pkgs.docker}/bin/docker run --rm --name %n \
+        ${pkgs.podman}/bin/podman run --rm --name %n \
         --env-file=/run/secrets/drone-server \
         --env=DRONE_AGENTS_ENABLED=true \
         --env=DRONE_GITEA_SERVER=https://git.cloonar.com \