Add GitHub Actions example to deploy on EC2

[AbdassalamAhmad]

This workflow will do the following:

• login to docker hub.
• build docker image and push it to your account.
• install docker on AWS EC2.
• pull latest docker image and run it on your EC2.

This workflow require:

• Public EC2 running to provide the IP as a secret.
• Private SSH key as a secret (you can have this once you build your EC2 from AWS Console).
• Your Docker Hub username, and Access token as a secret.