staging: also run Guichet from nix

cluster/staging/app/directory/deploy/directory.hcl

@@ -86,23 +86,21 @@ EOH
     count = 1
 
     network {
-      port "web_port" { to = 9991 }
+      port "web_port" { static = 9991 }
     }
 
     task "guichet" {
-      driver = "docker"
+      driver = "nix2"
       config {
-        image = "superboum/guichet_amd64:15"
-        readonly_rootfs = true
-        ports = [ "web_port" ]
-        volumes = [
-          "secrets/config.json:/config.json"
+        packages = [
+          "git+https://git.deuxfleurs.fr/Deuxfleurs/guichet.git?ref=main&rev=085a7cfd26c553adfc3ca9d9dd3e043753b0d3ea"
         ]
+        command = "guichet"
       }
 
       template {
         data = file("../config/guichet/config.json.tpl")
-        destination = "secrets/config.json"
+        destination = "config.json"
       }
 
       resources {
@@ -117,7 +115,6 @@ EOH
           "tricot guichet.staging.deuxfleurs.org",
         ]
         port = "web_port"
-        address_mode = "host"
         check {
           type = "tcp"
           port = "web_port"