add bot to tweet the release

.github/workflows/twitter-bot.yml

@@ -0,0 +1,15 @@
+name: "Tweet the release"
+on:
+  release:
+    types: [released]
+jobs:
+  twitter-release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: ethomson/send-tweet-action@v1
+        with:
+          status: "A new minikube version just released ! check it out https://github.com/kubernetes/minikube/blob/master/CHANGELOG.md"
+          consumer-key: ${{ secrets.TWITTER_API_KEY }}
+          consumer-secret: ${{ secrets.TWITTER_API_SECRET }}
+          access-token: ${{ secrets.TWITTER_ACCESS_TOKEN }}
+          access-token-secret: ${{ secrets.TWITTER_ACCESS_TOKEN_SECRET }}