Deriving from an environment var from another github action var

gistfile1.txt

env:
  BASE_EE_VERSION: ${{ ANSIBLE_CORE_VERSION }}-${{ EE_VERSION }}

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Set derived variables
        run: |
          echo "CI_COMMIT_MESSAGE=Release a new version of the Execution Environment: ${{ env.BASE_EE_VERSION }}" >> $GITHUB_ENV
      - name: Check environment variable is available
        run: |
          echo "${{ env.CI_COMMIT_MESSAGE }}"  # Should return Release a new version of the Execution Environment: 12.10.2-1