v3.1.0

Skip AWS auth if Gitops aws configuration empty in atmos settings @goruha (#34)

## what * Skip AWS auth if Gitops aws configuration empty in atmos settings

Why

• Allow to skip AWS auth and use an external one
• Make the action cloud agnostic

Example

If atmos.yaml contains

integrations:
  github:
    gitops:
      opentofu-version: 1.7.3    
      terraform-version: 1.5.7
      infracost-enabled: false
      artifact-storage:
        region: us-east-2
        bucket: cptest-core-ue2-auto-gitops
        table: cptest-core-ue2-auto-gitops-plan-storage
        role: arn:aws:iam::461333128641:role/cptest-core-ue2-auto-gha-iam-gitops-gha
# here used to be
#      role:
#        plan: arn:aws:iam::582055374050:role/cptest-core-gbl-identity-planners
#        apply: arn:aws:iam::582055374050:role/cptest-core-gbl-identity-gitops
      matrix:
        sort-by: .stack_slug
        group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")