constellation/.github/actions/pick_azure_region/action.yml

name: Pick an Azure region
description: "Pick an Azure region"

inputs:
  attestationVariant:
    description: "Attestation variant to use. Not all regions support all variants."
    required: true

outputs:
  region:
    description: "One of the supported Azure regions"
    value: ${{ steps.pick-region.outputs.region }}

runs:
  using: "composite"
  steps:
    - name: Pick a region
      id: pick-region
      shell: bash
      run: |
        possibleRegionsSNP=(
          "westus"
          "eastus"
          "northeurope"
          "westeurope"
          "southeastasia"
        )
        possibleRegionsTDX=(
          "centralus"
          "eastus2"
          "northeurope"
          "westeurope"
        )

        if [[ "${{ inputs.attestationVariant }}" == "azure-tdx" ]]; then
          possibleRegions=("${possibleRegionsTDX[@]}")
        else
          possibleRegions=("${possibleRegionsSNP[@]}")
        fi

        region=${possibleRegions[$RANDOM % ${#possibleRegions[@]}]}
        echo "region=$region" | tee -a "$GITHUB_OUTPUT"