Clean up tmp dir after deploys

We were relying on the OS to clean up the temporary directory used for deploy prep.  This does it automatically now after the deploy succeeds.

Author: bcomnes

package.json

@@ -50,6 +50,7 @@
     "parallel-transform": "^1.1.0",
     "pump": "^3.0.0",
     "qs": "^6.5.2",
+    "rimraf": "^2.6.3",
     "tempy": "^0.2.1",
     "through2-filter": "^3.0.0",
     "through2-map": "^3.0.0",
@@ -76,7 +77,6 @@
     "npm-run-all": "^4.1.3",
     "nyc": "^13.3.0",
     "prettier": "^1.16.4",
-    "rimraf": "^2.6.3",
     "webpack": "^4.29.5",
     "webpack-cli": "^3.2.3"
   },

src/deploy/index.js

@@ -3,6 +3,8 @@ const hashFiles = require('./hash-files')
 const hashFns = require('./hash-fns')
 const cleanDeep = require('clean-deep')
 const tempy = require('tempy')
+const promisify = require('util.promisify')
+const rimraf = promisify(require('rimraf'))
 const { waitForDiff } = require('./util')
 
 const { waitForDeploy, getUploadList, defaultFilter } = require('./util')
@@ -102,6 +104,8 @@ module.exports = async (api, siteId, dir, opts) => {
     phase: 'stop'
   })
 
+  await rimraf(opts.tmpDir)
+
   const deployManifest = {
     deployId,
     deploy,