on ubuntu and windows runners env.CONDA is null

[robandpdx]

I am following the example for caching conda environments. My workflow file looks like this...

name: Conda cache test
on:
  pull_request:
  workflow_dispatch:
defaults:
  run:
    shell: bash -el {0}
jobs:
  conda:
    strategy:
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    runs-on: ${{ matrix.os }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Setup Miniconda
        uses: conda-incubator/setup-miniconda@v3.0.4
        with:
          python-version: '3.8'
          activate-environment: myenv
      - name: Get Date
        id: get-date
        run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT
      - name: Cache Conda env
        uses: actions/cache@v3
        with:
          path: ${{ env.CONDA }}/envs
          key:
            conda-${{ runner.os }}--${{ runner.arch }}--${{ steps.get-date.outputs.today }}-${{ env.CACHE_NUMBER }}
        env:
          # Increase this value to reset cache if etc/example-environment.yml has not changed
          CACHE_NUMBER: 0
        id: cache

The logs show the following on an ubuntu-latest runner...

Run actions/cache@v3
  with:
    path: /envs
    key: conda-Linux--X64--[2](https://github.com/robandpdx/tools/actions/runs/8915174163/job/24484247942#step:5:2)0240501-0
    enableCrossOsArchive: false
    fail-on-cache-miss: false
    lookup-only: false
  env:
    INPUT_RUN_POST: true
    CONDA_PKGS_DIR: /home/runner/conda_pkgs_dir
    CACHE_NUMBER: 0
Cache not found for input keys: conda-Linux--X64--20240501-0

The logs show the following on a windows-latest runner...

Run actions/cache@v3
  with:
    path: /envs
    key: conda-Windows--X64--[2](https://github.com/robandpdx/tools/actions/runs/8915174163/job/24484248541#step:5:2)0240501-0
    enableCrossOsArchive: false
    fail-on-cache-miss: false
    lookup-only: false
  env:
    INPUT_RUN_POST: true
    CONDA_PKGS_DIR: C:\Users\runneradmin\conda_pkgs_dir
    CACHE_NUMBER: 0
Cache not found for input keys: conda-Windows--X64--20240501-0

However, on a macos-latest runner, the env.CONDA does resolve as expected...

Run actions/cache@v3
  with:
    path: /Users/runner/miniconda3/envs
    key: conda-macOS--ARM64--[2](https://github.com/robandpdx/tools/actions/runs/8915174163/job/24484248219#step:5:2)0240501-0
    enableCrossOsArchive: false
    fail-on-cache-miss: false
    lookup-only: false
  env:
    INPUT_RUN_POST: true
    CONDA: /Users/runner/miniconda[3](https://github.com/robandpdx/tools/actions/runs/8915174163/job/24484248219#step:5:3)
    CONDA_PKGS_DIR: /Users/runner/conda_pkgs_dir
    CACHE_NUMBER: 0
Cache not found for input keys: conda-macOS--ARM64--20240501-0