scripts/deploy: print a deployment plan before executing it

scripts/deploy

@@ -302,6 +302,18 @@ proc main (...args) {
     }
   }
 
+  info "build plan -----"
+  # TODO: dedupe this logic with `deployHosts`
+  for hset in (earlyHosts, lateHosts) {
+    for v in (variants) {
+      for h in (hset) {
+        info "- $h$v"
+      }
+    }
+  }
+  info "-----"
+
+
   deployHosts (...earlyHosts)
   deployHosts (...lateHosts)