replace "runner" by "executor" for logs

hcl/builder.hcl

@@ -2,7 +2,7 @@ job "builder" {
   namespace = "ci"
   type = "batch"
 
-  datacenters = ["neptune", "jupiter", "corrin", "bespin"]
+  datacenters = ["bespin", "corrin"]
   priority = 100
 
   parameterized {
@@ -57,6 +57,7 @@ fi
 
   task "executor" {
     driver = "docker"
+    leader = true
     config {
       image = "nixpkgs/nix:nixos-22.11"
       args = [ "/tmp/builder.sh" ]
@@ -162,11 +163,6 @@ experimental-features = nix-command flakes
         cpu    = 1000
         memory = 4000
     }
-
-    lifecycle {
-      hook = "prestart"
-      sidecar = true
-    }
   }
   }
 }

main.go

@@ -302,7 +302,7 @@ func build(w http.ResponseWriter, r *http.Request) {
 
 	allocFS := NomadClient.AllocFS()
 	scancel := make(chan struct{})
-	sframe, serr := allocFS.Logs(myAlloc, true, "runner", logFilter, "start", 0, scancel, &nomad.QueryOptions{})
+	sframe, serr := allocFS.Logs(myAlloc, true, "executor", logFilter, "start", 0, scancel, &nomad.QueryOptions{})
 
 	// stream logs to client's browser
 build_loop: