fix(build): Add publish:latest 🐳

Add authorize-push script by @boennemann so travis can push changes which is run as a pre-script,
then publish:latest runs to checkout the latest branch, commit the built files and move the tag
(which totally works with the github release, crazy, I know).

#445

Author: Kent C. Dodds

package.json

@@ -28,7 +28,9 @@
     "report-coverage": "cat ./coverage/lcov.info | node_modules/.bin/codecov",
     "code-checks": "eslint src/",
     "commit": "git-cz",
-    "semantic-release": "semantic-release pre && npm run build && npm publish && semantic-release post"
+    "prepublish:latest": "node scripts/authorize-push.js",
+    "publish:latest": "git checkout latest && git add dist && with-package git commit -m pkg.version && with-package F_VERSION=pkg.version git tag v${F_VERSION} -f && git push origin latest --tags -f",
+    "semantic-release": "semantic-release pre && npm run build && npm publish && semantic-release post && npm run publish:latest"
   },
   "betterScripts": {
     "build:dist": {

scripts/authorize-push.js

@@ -0,0 +1,12 @@
+var exec = require('child_process').exec
+
+var GH_TOKEN = process.env.GH_TOKEN
+var repo = require('../package.json').repository.url
+
+if (!(process.env.CI && GH_TOKEN && repo)) {
+  process.exit(1)
+}
+
+exec('git remote set-url origin ' + repo.replace('https://', 'https://' + GH_TOKEN + '@') + ' && ');
+exec('git config user.email formly-js@angular-formly.com && ');
+exec('git config user.name "formly-bot"');