Add circle ci pipeline to validate the codes automatically

[ozbillwang]

• Add circle ci pipeline to validate the codes automatically
• Did the same for tf_aws_ecs module
• upgrade terraform version to 0.10.0
• repository owner need to add this project in circle ci.

Successfully build at https://circleci.com/gh/BWITS/tf_aws_rds/2

[antonbabenko]

Thanks for this code. I have applied it partially to VPC module some time ago, but disabled it because I am not sure how to reduce amount of copy-pastes of config.yml files between 10+ repositories.

Do you know if we can keep it outside (in a separate repository, for example), and include it dynamically when circleci triggers the workflow?

[brandonjbjelland]

I've built out and run CI that is common across several similar projects in the past. This looks pretty similar. 😄

The approach we took was having a barebones common CI config file in each repo. All identical and very minimal. Within that, a git clone is made to another repo (the CI/CD automation repo) which houses the shared build, test, release, and notification code. This way, collaboration on the CI/CD portion can happen separately of the modules themselves and duplication is mostly avoided.

Thoughts?