Exploring github actions

Github actions flow:

1. Name of the workflow using keyword name: <workflow name>
2. Trigger type using keyword on: <[type]> | <type> Example of types: `push, pull_requests(opened, closed, merged), issues(created, closed), external events, schedule
3. One or more jobs using keyword jobs
4. Each job runs on a virtual machine specified by keyword runs-on: <machine type>
5. Jobs have steps in array form using keyword steps: array of steps

Example of simple workflow

name: Introduction to github actions

on: [push]

jobs:
  run-greetings-command:
    runs-on: ubuntu-latest
    steps:
      - name: Greet github actions from shell command
        run: echo "Hello github actions"