Green DevOps: Sustainable CI/CD

**Is your feature request related to a problem? Please describe.**
DevOps is an integral part of the Software development life cycle. Pipeline Runs and DevOps tools are not being used in an optimized way and this is increasing the carbon footprint.

**Describe the solution you'd like**
I would like to build best practices with examples of doing green DevOps.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
I am writing a 3 part blog post here : Check out the first one here : https://medium.com/@tajinder.singh1985/green-devops-sustainable-way-of-doing-devops-e69429b01933