Improve Yarn caching on Travis CI and Heroku

.travis.yml

@@ -1,13 +1,22 @@
+before_install:
+  - eval "$(curl -sL https://raw.githubusercontent.com/colesbury/travis-remote-shell/master/run.sh)"
 language: node_js
 node_js:
   - "node"
+cache:
+  directories:
+    - node_modules/.cache
+    - $HOME/.cache/yarn
 dist: trusty
 os:
   - linux
 script:
-  - yarn seed
   - yarn test
+  - yarn build
+  - yarn exp-publish
+before_deploy: rm -rf .tmp node_modules build/client/ios build/client/android
 deploy:
+  skip_cleanup: true
   provider: heroku
   api_key:
     secure: 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

README.md

@@ -441,12 +441,7 @@ yarn start
 
 ### Deploying to [Heroku]
 
-1. Add your app to Heroku
-1. Allow Heroku to install build time dependencies from the devDependencies in `package.json`: `Settings -> Config
-   Variables -> Add`, KEY: `YARN_PRODUCTION`, VALUE: `false`.
-1. Add `EXP_USERNAME` and `EXP_PASSWORD` config variables there as well. They will be used to publish mobile Expo Client
-   applications
-1. Deploy your app on Heroku
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
 
 ### Heroku Demo
 

package.json

@@ -21,7 +21,8 @@
     "rollback": "knex migrate:rollback",
     "exp-login": "cross-env NODE_ENV=production spin exp login -u $EXP_USERNAME -p $EXP_PASSWORD --non-interactive",
     "watch": "spin watch",
-    "heroku-postbuild": "rm -rf build && npm run exp-login && npm run build && npm run exp -- p --non-interactive && npm run seed",
+    "exp-publish": "npm run exp-login && npm run exp -- p --non-interactive",
+    "heroku-postbuild": "NODE_ENV=production npm run seed",
     "precommit": "lint-staged",
     "cli": "node tools/cli",
     "postinstall": "opencollective postinstall",
@@ -70,6 +71,7 @@
     "apollo-logger": "0.1.1",
     "apollo-server-express": "^1.3.2",
     "apollo-upload-server": "^3.0.0",
+    "babel-polyfill": "^6.26.0",
     "bcryptjs": "^2.4.3",
     "body-parser": "^1.18.2",
     "bootstrap": "4.0.0-beta.2",
@@ -150,7 +152,6 @@
     "babel-plugin-transform-decorators-legacy": "^1.3.4",
     "babel-plugin-transform-react-remove-prop-types": "^0.4.12",
     "babel-plugin-transform-runtime": "^6.23.0",
-    "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "babel-preset-flow": "^6.23.0",
     "babel-preset-minify": "^0.2.0",