fix: skip build task during hot-reloading

Previously, the module being hot-reloaded was rebuilt following the hot
reload operation.

This is an unnecessary step, and is removed in this commit to reduce CPU
load.

garden-service/src/tasks/helpers.ts

@@ -10,7 +10,6 @@ import * as Bluebird from "bluebird"
 import { flatten } from "lodash"
 import { computeAutoReloadDependants, withDependants } from "../watch"
 import { DeployTask } from "./deploy"
-import { BuildTask } from "./build"
 import { getNames } from "../util/util"
 import { Garden } from "../garden"
 import { Module } from "../types/module"
@@ -29,15 +28,11 @@ export async function getTasksForHotReload(
     await computeAutoReloadDependants(garden)))
     .filter(m => !hotReloadModuleNames.has(m.name))
 
-  const buildTask = new BuildTask({ garden, module, force: true })
-
-  const deployTasks = (await servicesForModules(garden, modulesForDeployment, serviceNames))
+  return (await servicesForModules(garden, modulesForDeployment, serviceNames))
     .map(service => new DeployTask({
       garden, service, force: true, forceBuild: true, watch: true, hotReloadServiceNames,
     }))
 
-  return [buildTask, ...deployTasks]
-
 }
 
 export async function getHotReloadModuleNames(garden: Garden, hotReloadServiceNames: string[]): Promise<Set<string>> {