fix: align pipeline and nomad with i80 deployment pattern

- Use docker build/push directly (no buildx)
- Add Harbor auth via Consul key in nomad task
- Remove unused buildx steps

erika.nomad

@@ -71,6 +71,10 @@ job "web-erika" {
         image      = "registry.i80.dk/gitea/web-erika:latest"
         ports      = ["http"]
         force_pull = true
+        auth {
+          username = "robot$gitserver"
+          password = "${HARBOR_ROBOT_TOKEN}"
+        }
       }
 
       restart {
@@ -80,6 +84,14 @@ job "web-erika" {
         mode     = "fail"
       }
 
+      template {
+        data = <<EOH
+HARBOR_ROBOT_TOKEN="{{ key "harbor/robot/token" }}"
+EOH
+        destination = "secrets/registry.env"
+        env         = true
+      }
+
       env {
         APP_ENV = "production"
         PORT    = "${NOMAD_PORT_http}"