ci: Introduce github action ci(lint, test, etc)

[wonchulee]

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Description

For a better Terraform Provider development environment, we need to build a CI environment using github action.

• linter (golangci-lint or others)
• test (unit test, acceptance test)
  • Add acceptance test in github action requires a new test account in ncloud, If it blocks this issue, we could separate the issue for the acceptance test.
• etc?

References

• https://github.com/hashicorp/terraform-provider-aws
• https://github.com/hashicorp/terraform

[moto6]

@wonchulee can i try this issue?

[wonchulee]

@moto3z Sure