Cache Save/Restore is not working between GitHub Runner and Container, even with the same absolute path.

[sabbott1877]

I'm trying to cache files in a standard runner and then access them in a container, but the files aren't being restored as expected.

I noticed the issue mentioned in #1444 (which would be great to have fixed) and read through the guidance in the cross-os-cache docs. From what I understand, the full absolute path for saving and restoring the cache must be identical across environments. In an attempt to address this, I tried placing the files in /tmp/, but even when the full absolute path matches and I've set enableCrossOsArchive: 'true', it still doesn't work. You can see the failure in this run: https://github.com/sabbott1877/cache-issues/actions/runs/10608423120/job/29402474270.

name: Cache Issue Testing
on:
  push:
    branches:
      - '**'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read
jobs:
  create-cache:
    name: Setup Cache
    runs-on: ubuntu-latest
    steps:
      - run: | 
          echo ~
          echo $PWD
      # Trying to use /tmp to avoid issues with absolute paths, but still seems to be failing.
      - name: Create files
        run: |
          mkdir -p /tmp/cache-path/
          echo "test" > /tmp/cache-path/file.txt

      - name: Cache Files
        uses: actions/cache/save@v4
        with:
          path: /tmp/cache-path
          key: cache-path-${{ github.run_id }}
          enableCrossOsArchive: 'true'
  read-cache:
    name: Read Cache
    needs: create-cache
    runs-on: ubuntu-latest
    container:
      image: rockylinux:9
      options: -u root
    steps:
      - run: |
          echo ~
          echo $PWD
      - name: Get Cached Files
        uses: actions/cache/restore@v4
        with:
          path: /tmp/cache-path
          key: cache-path-${{ github.run_id }}
          enableCrossOsArchive: 'true'
          fail-on-cache-miss: 'true'